Vannax suddenly gave an ah! of delight as another crescent appeared by the first on the screen. He manipulated several dials to make the two images move toward each other and then merge into a single one again.
Wolff knew that the machine was sending out a frequency-tracer and had located that of the crescent set into the floor of the control room. Next, Vannax would subject the crescents clamped to the console to a treatment which would change their resonance to match that of the control room. Where Vannax had gotten the two semicircles was a mystery until Wolff thought of that crescent which must have accompanied him when he passed through the gate to the Amerindian tier. Somehow, during the time between his capture and the flight, he had gotten hold of this crescent. He must have hidden it in the ruins before the ape had captured him.
Vannax looked up from his work, saw the three, glanced at the screen, and snatched the two crescents from the spring-type clamps on the console. The three ran toward him as he placed one crescent on the floor and then the other. He laughed, made an obscene gesture, and stepped into the circle, a dagger in his hand.
Wolff gave a cry of despair, for they were too far away to stop him. Then he stopped and threw a hand over his eyes, but too late to shut out the blinding flash. He heard Kickaha and Podarge, also blinded, shouting. He heard Vannax’s scream and smelled the burned flesh and clothes.
Sightlessly, he advanced until his feet touched the hot corpse.
“What the hell happened?” Kickaha said. “God, I hope we’re not permanently blinded!”
“Vannax thought he was slipping in through Arwoor’s gate in the control room,” Wolff said. “But Arwoor had set a trap. He could have been satisfied with wrecking the matcher, but it must have amused him to kill the man who would try it.”
He stood and waited, knowing that time was getting short and that he was not serving his cause or anyone else’s by his patience with his blindness. But there was nothing else he could do. And, after what seemed like an unbearably long time, sight began to come back.
Vannax was lying on his back, charred and unrecognizable. The two crescents were still on the floor and undamaged. These were separated a moment later by Wolff with a scribe from a console.
“He was a traitor,” Wolff said in a low voice to Kickaha. “But he did us a service. I meant to try the same trick, only I was going to use the horn to activate the crescent you hid after I’d changed its resonance.”
Pretending to inspect other consoles for boobytraps, he managed to get Kickaha and himself out of ear-range of Podarge.
“I didn’t want to do it,” he whispered. “But I’m going to have to. The horn must be used if we’re to drive Arwoor out of the control room or get him before he can use his crescents to escape.”
“I don’t get you,” Kickaha said.
“When I had the palace built, I incorporated a thermitic substance in the plastic shell of the control room. It can be triggered only by a certain sequence of notes from the horn, combined with another little trick. I don’t want to set the stuff off because the control room will then also be lost. And this place will be indefensible later against any other Lords.”
“You better do it,” Kickaha said. “Only thing is, what’s to keep Arwoor from getting away through the crescents?”
Wolff smiled and pointed at the console. “Arwoor should have destroyed that instead of indulging his sadistic imagination. Like all weapons, it’s twoedged.”
He activated the control, and, again, an image of the crescent shone on the screen. Curving lines of light ran across the plate. Wolff went to another console and opened a little door on the top to reveal a panel with unmarked controls. After flipping two, he pressed a button. The screen went blank.
“The resonance of his crescent has been changed,” Wolff said. “When he goes to use it with any of the others he has, he’ll get a hell of a shock. Not the kind Vannax got. He just won’t have a gate through which to escape.”