Crag waited impatiently, aware that precious moments were fleeing. He was afraid to look at his gauge, plagued by the sense of vanishing moments. Time was running out and eternity was drawing near--near to Adam Crag as well as the sniper. The rocks extended before him, a kaleidoscopic pattern of black and white. Somewhere in the tortuous labyrinth was the man he had to kill before he himself died. He watched nervously, trying to suppress the tension pulling at his muscles. A nerve in his cheek twitched and he shook his head without removing his eyes from the rocks ahead. Still there was no sign of the other. Who was the stalker and who was the stalked? The question bothered him. Perhaps even at that instant the sniper was drawing bead. Then he'd be free to reach Red Dog--safety. Crag decided he couldn't wait. He'd have to seek the other out, somehow flush him from cover. He looked around. Off to one side a shelf of black rock angled incongruously into the sky. Its sides were steep but its top would command all approaches to the tip of the crescent. He made his way to the base of the shelf and began scrambling up its steep sides, finding it difficult to manage toe and hand holds. He slipped from time to time, hanging desperately on to keep himself from rolling back to the rocks below. Just below the top he rested, panting, fighting for breath, conscious of his heart thudding in his ears. He had to hurry! Slowly, laboriously he pulled himself up the last few feet and lay panting atop the shelf, none too soon. The sniper scrambled out of the rocks a scant hundred yards from Crag's position. He raised his rifle, then hesitated. The Red Dog crewman had fallen to his hands and knees and was fighting to rise. He pushed his hands against the plain in an attempt to get his feet under him. Crag lowered his rifle and watched curiously. The sniper finally succeeded in getting to his feet. He stood for a moment, weaving, before moving toward Crag's shelf with a faltering zigzag gait. Crag raised the rifle and tried to line the sights. He had difficulty holding the weapon steady. He started to pull the trigger when the man fell again. Crag hesitated. The sniper floundered in the ash, managed to pull himself half-erect. He weaved with a few faltering steps and plunged forward on his face. Crag watched for a moment. There was no movement. The black blob of the suit lay with the stillness of the rocks in the brazen heat of the crater. So that's the way a man dies when his oxygen runs out, he thought. He just plops down, jerks a little and departs, with as little ceremony as that. He grinned crookedly, thinking he had just watched a rehearsal of his own demise. He watched for a moment longer before turning his face back toward the plain.