brightened. Its source came into sight—a ball of dazzling brilliance, oval and about the size of a man's torso. It emerged into sunlight and Craig saw that it was solid. It looked like incandescent metal, but he somehow felt that it wasn't hot. It seemed to move at will and to hover without support. It acted alive. It moved a little way toward Craig and Brulieres, then stopped. A tentative rumble came from it, like the beginning of thunder. Something like a tentacle lifted, clutching an object that resembled a flashlight. A blinding lance of heat shot from the object and struck the rock a few yards in front of the two men. A sound came from the rock like ice pressed upon a hot stove. Smoke puffed upward. The beam lasted only an instant, but it left a long curved scar in the rock. The thing rumbled again, and flashed so brightly Craig threw an arm over his eyes, and heard his own voice cry out wordlessly. His legs tensed to run, but something about the behavior of the thing held him where he was. It seemed unsure of itself, and not really threatening. When he looked up again, it was moving laterally and up the face of the wall. He saw the flashlight-like object on the ground where it had evidently been dropped. The oval thing, no longer glowing, lifted fast toward the mountain top. He saw that it was metal, not rusted or corroded but dull with age, and he saw the two ragged holes near the middle of it. He strained his eyes for more detail but it grew tiny in the distance and he saw no joints and no protuberances other than the one tentacle. He lost it in the shadows of the mountain's brow, then saw it flash momentarily in the sun as it curved up and over. After a moment he turned dazedly toward Brulieres. But before he could say anything there was a sun-dimming flash of light from beyond the mountain. The ground danced. Sound, echoing from the other peaks and battering its way through the solid rock of the mountain, beat about them like monstrous punishing wings. As the vast thunder dwindled away, Craig, squinting, saw a tenuous, rapidly dimming mushroom cloud tower above the peak. He flinched, but knew that this would be another clean explosion. Most of the cloud was steam. He was sure they were seeing a re-enactment of the blast which had cleared this plateau. His mind worked in simple patterns: the thing was destroyed;