“Instantly he flipped around, his feet flying over his head, and landed flat on his back against the wall. The rebound was stronger, it seemed, and his hands tore loose from the handhold. He flew across the battleroom, tumbling over and over.

For a sickening moment he tried to retain his old up-and-down orientation, his body attempting to right itself, searching for the gravity that wasn’t there. Then he forced himself to change his view. He was hurtling toward a wall. That was down. And at once he had control of himself. He wasn’t flying, he was falling. This was a dive. He could choose how he would hit the surface.”