"Don't know how we'll do any of that either. It's a problem for after we've solved our own, but I'm keeping it in mind. If Dr. Solis used the portals to discover other worlds, and if we figure out how sending things the other way works, maybe like that."

But, again, a later problem and he waves it aside with a hand.

"Or we send the nearest World Eater backward like that, or we escape to somewhere else. Those just delay the problem, but maybe we need the time. I don't know what it takes to make enough bombs to bring one of the huge ones down. Don't really even know how big they get."