The Human Edge (42 page)

More, the alien, had he had a companion, would probably have been trying to get message equipment of his own up into favorable dispatching position. Lacking a companion his plan must be to frustrate the human effort. That put the humans at an additional disadvantage. They were the defenders, and could only wait for the attacker to choose the time and place of his attempt against them.

And it would not have to be too successful an attempt, at that. It would not be necessary to kill either Cal or Maury, now that Doug was gone. To cripple one of them enough so that he could not climb and help his companion climb, would be enough. In fact, if one of them were crippled Cal doubted even that they could make it back to the
Harrier.
The alien then could pick them off at leisure.

Engrossed in his thoughts, half-deafened by the ceaseless wind, Cal woke suddenly to the vibration of something thundering down on him.

He jerked his head to stare upslope—and scrambled for his life. It was like a dream, with everything in slow motion—and one large chunk of rock with its small host of lesser rocks roaring down upon him.

Then—somehow—he was clear. The miniature avalanche went crashing by him, growing to a steady roar as it grew in size sweeping down alongside the ridge. Cal found himself at the tent, from which Maury was half-emerged, on hands and knees, staring down at the avalanche.

Cal swore at himself. It was something he had been told, and had forgotten. Such places as they had camped in last night were natural funnels for avalanches of loose rock. So, he remembered now, were wide cracks like the sloping one in the cliff face they had climbed up yesterday—as, indeed, the cwm itself was on a large scale. And they had crossed the cwm in late afternoon, when the heat of the day would have been most likely to loosen the frost that held precariously balanced rocks in place.

Only fool luck had gotten them this far!

"Load up!" he shouted to Maury. "We've got to get out of here."

Maury had already seen that for himself. They left the pup-tent standing. The tent in Cal's load would do. With that, the Messenger, their climbing equipment, their sleeping bags and their food and water, they began to climb the steeply sloping wall of the ridge below which they had camped. Before they were halfway up it, another large rock with its attendant avalanche of lesser rocks came by below them.

Whether the avalanches were alien-started, or the result of natural causes, made no difference now. They had learned their lesson the hard way. From now on, Cal vowed silently, they would stick to the bare and open ridges unless there was absolutely no alternative to entering avalanche territory. And only after every precaution.

In the beginning Cal had kept a fairly regular check on how Maury was doing behind him. But as the sun rose in the bluish-black of the high altitude sky overhead the weariness of his body seemed to creep into his mind and dull it. He still turned his head at regular intervals to see how Maury was doing. But sometimes he found himself sitting and staring at his companion without any real comprehension of why he should be watching over him.

The blazing furnace of K94 overhead, climbing toward its noontime zenith, contributed to this dullness of the mind. So did the ceaseless roaring of the wind which had long since deafened them beyond any attempt at speech. As the star overhead got higher in the sky this and the wind noise combined to produce something close to hallucinations . . . so that once he looked back and for a moment seemed to see the alien following them, not astraddle the ridge and hunching themselves forward as they were, but walking along the knife-edge of rock like a monkey along a branch, foot over foot, and grasping the rock with toes like fingers, oblivious of the wind and the sun.

Cal blinked and, the illusion—if that was what it was—was gone. But its image lingered in his brain with the glare of the sun and the roar of the wind.

His eyes had fallen into the habit of focusing on the rock only a dozen feet ahead of him. At last he lifted them and saw the ridge broaden, a black shadow lying sharply across it. They had come to the rock walls below the hanging glacier they had named the Hook.

They stopped to rest in the relative wind-break shelter of the first wall, then went on.

Considering the easiness of the climb they made remarkably slow progress. Cal slowly puzzled over this until, like the slow brightening of a candle, the idea grew in him to check the absolute altimeter at his belt

They were now nearly seven thousand feet higher up than they had been at the wreck of the
Harrier.
The mask respirators had been set to extract oxygen for them from the local atmosphere in accordance with the
Harrier
altitude. Pausing on a ledge, Cal adjusted his mask controls.

For a minute there seemed to be no difference at all. And then he began to come awake. His head cleared. He became sharply conscious, suddenly of where he stood—on a ledge of rock, surrounded by rock walls with, high overhead, the blue-black sky and brilliant sunlight on the higher walls. They were nearly at the foot of the third, and upper, battlement of the rock walls.

He looked over the edge at Maury, intending to signal the man to adjust his mask controls. Maury was not even looking up, a squat, lumpish figure in the warmsuit totally covered, with the black snout of the mask over his face. Cal tugged at the rope and the figure raised its face. Cal with his gloved hands made adjusting motions at the side of his mask. But the other's face below, hidden in the shadow of the faceplate, stared up without apparent comprehension. Cal started to yell down to him—here the wind noise was lessened to the point where a voice might have carried—and then thought better of it.

Instead he tugged on the rope in the signal they had repeated an endless number of times; and the figure below, foreshortened to smallness stood dully for a moment and then began to climb. His eyes sharpened by the fresh increase in the oxygen flow provided by his mask Cal watched that slow climb almost with amazement carefully taking in the rope and belaying it as the other approached.

There was a heaviness, an awkwardness, about the warmsuited limbs, as slowly—but strongly enough—they pulled the climber up toward Cal. There was something abnormal about their movement. As the other drew closer, Cal stared more and more closely until at last the gloves of the climber fastened over the edge of the ledge.

Cal bent to help him. But, head down not looking, the other hoisted himself up alongside Cal and a little turned away.

Then in that last instant the combined flood of instinct and a lifetime of knowledge cried certainty. And Cal knew.

The warmsuited figure beside him was Maury no longer.

Reflexes have been the saving of many a man's life. In this case, Cal had been all set to turn and climb again, the moment Maury stood beside him on the edge. Now recognizing that somewhere among these rocks, in the past fumbling hours of oxygen starvation, Maury had ceased to live and his place had been taken by the pursuing alien, Cal's reflexes took over.

If the alien had attacked the moment he stood upright on the ledge, different reflexes would have locked Cal in physical combat with the enemy. When the alien did not attack, Cal turned instinctively to the second prepared response of his body and began automatically to climb to the next ledge.

There was no doubt that any other action by Cal, any hesitation, any curiosity about his companion would have forced the alien into an immediate attack. For then there would have been no reason not to attack. As he climbed, Cal felt his human brain beginning to work again after the hours of dullness. He had time to think.

His first thought was to cut the line that bound them together, leaving the alien below. But this would precipitate the attack Cal had already instinctively avoided. Any place Cal could climb at all, the alien could undoubtedly climb with ease. Cal's mind chose and discarded possibilities. Suddenly he remembered the gun that hung innocently at his hip. With that recollection, the situation began to clear and settle in his mind. The gun evened things. The knowledge that it was the alien on the other end of the rope, along with the gun, more than evened things. Armed and prepared, he could afford to risk the present situation for a while. He could play a game of pretense as well as the alien could, he thought.

That amazing emotional center of gravity, Cal's personal sense of security and adequacy that had so startled the psychology department at the university, was once more in command of the situation. Cal felt the impact of the question—why was the alien pretending to be Maury? Why had he adapted himself to man-shape, put on man's clothes and fastened himself to the other end of Cal's climbing rope?

Perhaps the alien desired to study the last human that opposed him before he tried to destroy it. Perhaps he had some hope of rescue by his own people, and wanted all the knowledge for them he could get. If so it was a wish that cut two ways. Cal would not be sorry of the chance to study a living alien in action.

And when the showdown came—there was the gun at Cal's belt to offset the alien's awesome physical natural advantage.

They continued to climb. Cal watched the other figure below him. What he saw was not reassuring.

With each wall climbed, the illusion of humanity grew stronger. The clumsiness Cal had noticed at first—the appearance of heaviness—began to disappear. It began to take on a smoothness and a strength that Maury had never shown in the climbing. It began in fact, to look almost familiar. Now Cal could see manlike hunching and bulgings of the shoulder muscles under the warmsuit's shapelessness, as the alien climbed and a certain trick of throwing the head from right to left to keep a constant watch for a better route up the face of the rock wall.

It was what he did himself, Cal realized suddenly. The alien was watching Cal climb ahead of him and imitating even the smallest mannerisms of the human.

They were almost to the top of the battlements, climbing more and more in sunlight. K94 was already far down the slope of afternoon. Cal began to hear an increase in the wind noise as they drew close to the open area above. Up there was the tumbled rock-strewn ground of a terminal moraine and then the snow slope to the hook glacier.

Cal had planned to camp for the night above the moraine at the edge of the snow slope. Darkness was now only about an hour away and with darkness the showdown must come between himself and the alien. With the gun, Cal felt a fair amount of confidence. With the showdown, he would probably discover the reason for the alien's impersonation of Maury.

Now Cal pulled himself up the last few feet. At the top of the final wall of the battlements the windblast was strong. Cal found himself wondering if the alien recognized the gun as a killing tool. The alien which had attacked them outside the
Harrier
had owned neither weapons nor clothing. Neither had the ones filmed as they fell from the enemy ship, or the one lying dead outside the fragment of that ship on the other side of the mountain. It might be that they were so used to their natural strength and adaptability they did not understand the use of portable weapons. Cal let his hand actually brush against the butt of the sidearm as the alien climbed on to the top of the wall and stood erect, faceplate turned a little from Cal.

But the alien did not attack.

Cal stared at the other for a long second, before turning and starting to lead the way through the terminal moraine, the rope still binding them together. The alien moved a little behind him, but enough to his left so that he was within Cal's range of vision, and Cal was wholly within his. Threading his way among the rock rubble of the moraine, Cal cast a glance at the yellow orb of K94, now just hovering above the sharp peaks of neighboring mountains around them.

Night was close. The thought of spending the hours of darkness with the other roped to him cooled the back of Cal's neck. Was it darkness the alien was waiting for?

Above them, as they crossed the moraine the setting sun struck blazing brilliance from the glacier and the snow slope. In a few more minutes Cal would have to stop to set up the puptent, if he hoped to have enough light to do so. For a moment the wild crazy hope of a notion crossed Cal's mind that the alien had belatedly chosen life over duty. That at this late hour, he had changed his mind and was trying to make friends.

Cold logic washed the fantasy from Cal's mind. This being trudging almost shoulder to shoulder with him was the same creature than had sent Doug's limp and helpless body skidding and falling down the long ice-slope to the edge of an abyss. This companion alongside was the creature that had stalked Maury somewhere among the rocks of the mountainside and disposed of him, and stripped his clothing off and taken his place.

Moreover, this other was of the same race and kind as the alien who had clung to the hull of the falling
Harrier
and, instead of trying to save himself and get away on landing, had made a suicidal attack on the eight human survivors. The last thing that alien had done, when there was nothing else to be done, was to try to take as many humans as possible into death with him.

This member of the same race walking side by side with Cal would certainly do no less.

But why was he waiting so long to do it? Cal frowned hard inside his mask. That question had to be answered. Abruptly he stopped. They were through the big rubble of the moraine, onto a stretch of gravel and small rock. The sun was already partly out of sight behind the mountain peaks. Cal untied the rope and began to unload the pup tent.

Out of the corner of his eyes, he could see the alien imitating his actions. Together they got the tent set up and their sleeping bags inside. Cal crawled in the tiny tent and took off his boots. He felt the skin between his shoulder blades crawl as a second later the masked head of his companion poked itself through the tent opening and the other crept on hands and knees to the other sleeping bag. In the dimness of the tent with the last rays of K94 showing thinly through its walls, the shadow on the far tent wall was a monstrous parody of a man taking off his boots.