The advance into the enclosure was inexorable.

Harry Vinson turned to the girl and shook his head. "Licked," he said bitterly.

"It wants—us," said Narina helplessly.

Vinson hurled the metal cube to the floor. "It's going to get us, too," he said. He turned from the scene outside and faced her.

"Narina," he said softly, "you're aces."

She looked up at him and a weary smile crossed her face. "How wrong we were—about you."

He nodded. "Too bad we didn't find it out sooner."

Narina shook her head bitterly. "So that this could have happened sooner? Why?"

"Maybe if we had been busy together, we would not have spent time building bigger and better machines against one another. Another thing, Narina, our machines are equipped with all we know about fighting and weapons. Had there been no strife—?"

A rumble came at the base of the building. Narina shuddered. "It's coming for us," she said in a whisper.