At last they stopped. They were standing in a gorge perhaps a quarter mile wide, below one of the lines of low, broken cliffs that flanked it on either side. He collapsed on the nearest boulder. Koriel stood a few paces ahead surveying the landscape. The line of crags immediately above them was interrupted by a notch, which marked the point where a steep and narrow cleft tumbled down to break into the wall of the main gorge. From the bottom of the cleft, a mound of accumulated rubble and rock debris led down about fifty feet to blend with the floor of the gorge not far from where they stood. Koriel stretched out an arm to point up beyond the cleft.

"Gorda will be roughly that way," he said without turning. "Our best way would be up and onto that ridge. If we stay on the flat and go around the long way, it'll be too far. What d'you say?"

The other stared up in mute despair. The rockfall, funneling up toward the mouth of the cleft, looked like a mountain. In the distance beyond towered the ridge, jagged and white in the glare of the sun. It was impossible.

Koriel allowed his doubts no time to take root. Somehow—slipping, sliding, stumbling, and falling—they reached the entrance to the cleft. Beyond it, the walls narrowed and curved around to the left, cutting off the view of the gorge below from where they had come. They climbed higher. Around them, sheets of raw reflected sunlight and bottomless pits of shadow met in knife-edges across rocks shattered at a thousand crazy angles. His brain ceased to extract the concepts of shape and form from the insane geometry of white and black that kaleidoscoped across his retina. The patterns grew and shrank and merged and whirled in a frenzy of visual cacophony.

His face crashed against his visor as his helmet thudded into the dust. Koriel hoisted him to his feet.

"You can do it. We'll see Gorda from the ridge. It'll be all downhill from there. . . ."

But the figure in red sank slowly to its knees and folded over. The head inside the helmet shook weakly from side to side. As Koriel watched, the conscious part of his mind at last accepted the inescapable logic that the parts beneath consciousness already knew. He took a deep breath and looked about him.