They ran. Between the hot death and the cold one. Together, away from the cliffs, out toward the distant, beckoning ship.
Never had they run this way in their lives. The sound of their feet running was a hard, insistent clatter over vast oblongs of rock, down into ravines, up the sides, and on again. They raked the air in and out their lungs. Behind them the cliffs faded into things they could never turn back to now.
They did not eat as they ran. They had eaten to the bursting point in the cave, to save time. Now it was only running, a lifting of legs, a balancing of bent elbows, a convulsion of muscles, a slaking in of air that had been fiery and was now cooling.
"Are they watching us?"
Lyte's breathless voice snatched at his ears above the pound of his heart.
Who? But he knew the answer. The cliff peoples, of course. How long had it been since a race like this one? A thousand days? Ten thousand? How long since someone had taken the chance and sprinted with an entire civilization's eyes upon their backs, into gullies, across cooling plain. Were there lovers pausing in their laughter back there, gazing at the two tiny dots that were a man and woman running toward destiny? Were children eating of new fruits and stopping in their play to see the two people racing against time? Was Dienc still living, narrowing hairy eyebrows down over fading eyes, shouting them on in a feeble, rasping voice, shaking a twisted hand? Were there jeers? Were they being called fools, idiots? And in the midst of the name-calling, were people praying them on, hoping they would reach the ship?
Sim took a quick glance at the sky, which was beginning to bruise with the coming night. Out of nowhere clouds materialized and a light shower trailed across a gully two hundred yards ahead of them. Lightning beat upon distant mountains and there was a strong scent of ozone on the disturbed air.
"The halfway mark," panted Sim, and he saw Lyte's face half turn, longingly looking back at the life she was leaving. ''Now's the time, if we want to turn back, we still have time. Another minute - "
Thunder snarled in the mountains. An avalanche started out small and ended up huge and monstrous in a deep fissure. Light rain dotted Lyte's smooth white skin. In a minute her hair was glistening and soggy with rain.
"Too late, now," she shouted over the patting rhythm of her own naked feet. "We've got to go ahead!"
And it was too late. Sim knew, judging the distances, that there was no turning back now.
His leg began to pain him. He favored it, slowing. A wind came up swiftly. A cold wind that bit into the skin. But it came from the cliffs behind them, helped rather than hindered them. An omen? he wondered. No.
For as the minutes went by it grew upon him how poorly he had estimated the distance. Their time was dwindling out, but they were still an impossible distance from the ship. He said nothing, but the impotent anger at the slow muscles in his legs welled up into bitterly hot tears in his eyes.
He knew that Lyte was thinking the same as himself. But she flew along like a white bird, seeming hardly to touch ground. He heard her breath go out and in her throat, like a clean, sharp knife in its sheath.
Half the sky was dark. The first stars were peering through lengths of black cloud. Lightning jiggled a path along a rim just ahead of them. A full thunderstorm of violent rain and exploding electricity fell upon them.
They slipped and skidded on moss-smooth pebbles. Lyte fell, scrambled up again with a burning oath. Her body was scarred and dirty. The rain washed over her.
The rain came down and cried on Sim. It filled his eyes and ran in rivers down his spine and he wanted to cry with it.
Lyte fell and did not rise, sucking her breath, her breasts quivering.
He picked her up and held her. "Run, Lyte, please, run!"
"Leave me, Sim. Go ahead!" The rain filled her mouth. There was water everywhere. "It's no use. Go on without me."
He stood there, cold and powerless, his thoughts sagging, the flame of hope blinking out. All the world was blackness, cold falling sheaths of water, and despair.
"We'll walk, then," he said. "And keep walking, and resting."
They walked for fifty yards, easily, slowly, like children out for a stroll. The gully ahead of them filled with water that went sliding away with a swift wet sound, toward the horizon.
Sim cried out. Tugging at Lyte he raced forward. "A new channel," he said, pointing. "Each day the rain cuts a new channel. Here, Lyte!" He leaned over the floodwaters.
He dived in, taking her with him.
The flood swept them like bits of wood. They fought to stay upright, the water got into their mouths, their noses. The land swept by on both sides of them. Clutching Lyte's fingers with insane strength, Sim felt himself hurled end over end, saw flicks of lightning on high, and a new fierce hope was born in him. They could no longer run - well, then they would let the water do the running for them.
With a speed that dashed them against rocks, split open their shoulders, abraded their legs, the new, brief river carried them. "This way!" Sim shouted over a salvo of thunder and steered frantically toward the opposite side of the gully. The mountain where the ship lay was just ahead. They must not pass it by. They fought in the transporting liquid and were slammed against the far side. Sim leaped up, caught at an overhanging rock, locked Lyte in his legs, and drew himself hand over hand upward.
As quickly as it had come, the storm was gone. The lightning faded. The rain ceased. The clouds melted and fell away over the sky. The wind whispered into silence.
"The ship!" Lyte lay upon the ground. "The ship, Sim. This is the mountain of the ship!"
Now the cold came. The killing cold.