Heat-shock, all the symptoms. Dry, flushed skin, the ragged breathing. Her temperature rising quickly as her body stopped fighting the heat and succumbed.
There was nothing he could do here to protect her from the heat. He measured a tiny portion of the remaining water into her mouth and she swallowed convulsively. Her thin clothing was little protection from the sun. He could only take her in his arms and keep on towards the horizon. An outcropping of rock threw a tiny patch of shade and he walked towards it.
The ground here, shielded from the direct rays of the sun, felt almost cool by contrast. Lea opened her eyes when he put her down, peering up at him through a haze of pain. She wanted to apologize to him for her weakness, but no words came from the dried membrane of her throat. His body above her seemed to swim back and forth in the heat waves, swaying like a tree in a high wind.
Shock drove her eyes open, cleared her mind for an instant. He really was swaying. Suddenly she realized how much she had come to depend on the unending solidity of his strength—and now it was failing. All over his body the corded muscles contracted in ridges, striving to keep him erect. She saw his mouth pulled open by the taut cords of his neck, and the gaping, silent scream was more terrible than any sound. Then she herself screamed as his eyes rolled back, leaving only the empty white of the eyeballs staring terribly at her. He went over, back, down, like a felled tree, thudding heavily on the sand. Unconscious or dead, she couldn't tell. She pulled limply at his leg, but couldn't drag his immense weight into the shade.
Brion lay on his back in the sun, sweating. Lea saw this and knew that he was still alive. Yet what was happening? She groped for memory in the red haze of her mind, but could remember nothing from her medical studies that would explain this. On every square inch of his body the sweat glands seethed with sudden activity. From every pore oozed great globules of oily liquid, far thicker than normal perspiration. Brion's arms rippled with motion and Lea gaped, horrified as the hairs there writhed and stirred as though endowed with separate life. His chest rose and fell rapidly, deep, gasping breaths racking his body. Lea could only stare through the dim redness of unreality and wonder if she was going mad before she died.
A coughing fit broke the rhythm of his rasping breath, and when it was over his breathing was easier. The perspiration still covered his body, the individual beads touching and forming tiny streams that trickled down his body and vanished in the sand. He stirred and rolled onto his side, facing her. His eyes were open and normal now as he smiled.
"Didn't mean to frighten you. It caught me suddenly coming at the wrong season and everything. It was a bit of a jar to my system. I'll get you some water now—there's still a bit left."
"What happened? When you looked like that, when you fell...."
"Take two swallows, no more," he said, holding the open canteen to her mouth. "Just summer change, that's all. It happens to us every year on Anvhar—only not that violently, of course. In the winter our bodies store a layer of fat under the skin for insulation, and sweating almost ceases completely. There are a lot of internal changes too. When the weather warms up the process is reversed. The fat is metabolized and the sweat glands enlarge and begin working overtime as the body prepares for two months of hard work, heat and little sleep. I guess the heat here triggered off the summer change early."
"You mean—you've adapted to this terrible planet?"