He moved forward again, then stopped; he was having trouble making up his mind. I flipped a key to drop a padded shock frame in place, and braced myself. Mallon would be getting mad now. Crimson danger lights flared on the board and I rocked under the recoil as my interceptors flashed out to meet Mallon's C-S C's and detonate them in incandescent rendezvous over the scarred concrete between us. My screens went white, then dropped back to secondary brilliance, flashing stark black-and-white. My ears hummed like trapped hornets. The sudden silence was like a vault door closing. I sagged back, feeling like Quasimodo after a wild ride on the bells. The screens blinked bright again, and I watched Mallon, sitting motionless now in his near blindness. On his radar screen I would show as a blurred hill; he would be wondering why I hadn't returned his fire, why I hadn't turned and run, why ... why.... He lurched and started toward me. I waited, then eased back, slowly. He accelerated, closing in to come to grips at a range where even the split micro-second response of my defenses would be too slow to hold off his fire. And I backed, letting him gain, but not too fast.... Mallon couldn't wait. He opened up, throwing a mixed bombardment from his 9 mm's, his infinite repeaters, and his C-S C's. I held on, fighting the battering frame, watching the screens. The gap closed; a hundred yards, ninety, eighty. The open silo yawned in Mallon's path now, but he didn't see it. The mighty Bolo came on, guns bellowing in the night, closing for the kill. On the brink of the fifty-foot-wide, hundred-yard-deep pit, it hesitated as though sensing danger. Then it moved forward. I saw it rock, dropping its titanic prow, showing its broad back, gouging the blasted pavement as its guns bore on the ground. Great sheets of sparks flew as the treads reversed, too late. The Bolo hung for a moment longer, then slid down majestically as a sinking liner, its guns still firing into the pit like a challenge to Hell. And then it was gone. A dust cloud boiled for a moment, then whipped away as displaced air tornadoed from the open mouth of the silo. And the earth trembled under the impact far below. X The doors of the Primary Site blockhouse were nine-foot-high, eight-inch-thick panels of solid chromalloy that even a Bolo would have slowed down for, but they slid aside for my electropass like a shower curtain at the YW. I went into a shadowy room where eighty years of silence hung like black crepe on a coffin. The tiled floor was still immaculate, the air fresh. Here at the heart of the Aerospace Center, all systems were still go.