"No. We tried to destroy them. We broke up the crystal spiderwebs they built between their worlds; we smashed their suns. But more than a quarter of them survived our first attack, and then we knew we were beaten. They were as powerful as we were, more so in some ways--" "Wait, I don't get it," said Maxwell unbelievingly. "You--attacked them--without provocation? Wiped out three-quarters of them, simply because--" "There was no possible peace between us and them," said the Beachcomber. "And it was only a matter of time before they discovered us; it was simply chance that we made the contact first." What would an unspoiled South Sea Islander have made of the first atomic war? Maxwell wondered. Morals of one society didn't apply to another, he knew. Still--was it possible that the Beachcomber's people, Maxwell's own descendants, still had a taint of the old Adam? And was it accident that they were the only dominant life-form in the entire universe, or had they eliminated all other contenders? * * * * * Not for him to judge, he decided; but he didn't like it. He said, "Then what--they counterattacked?" "Yes. We had time to prepare, and we knew what they were going to do. The trouble was, there simply was no defense against it." He noticed Maxwell's wry smile. "Not like the planet-busters; there is a defense against those, you just haven't found it yet. But there actually was no defense whatever against their weapon. They were going to destroy our universe, down to the last quantum--wipe it right out of the series, make a blank where it had been." "And--?" said Maxwell. He was beginning to understand why the Beachcomber had never told this story to anyone else; why the public at large must never know it. There was a feeling of doom in it that would color everything men did. It was possible, he supposed, to live with the knowledge that the end of it all was death, but fatalism was the mark of a dying culture. "And there was just one thing we could do," said the Beachcomber. "Not a defense, but a trick. At the instant before their weapon was due to take effect, we planned to bring our universe back three million years along its own time-line. It would vanish, just as if it had been destroyed. Then, if it worked, we'd be able to return, but on a different time-line--because, obviously, on our own line nothing like this doubling-back had already happened. Changing the past changes the future; you know the theory." "Yeah. So--you were too late, is that it? You got away, but all the rest were destroyed." "The timing was perfect," said the Beachcomber. "All the calculations were perfect. There's a natural limit to the distance in time any mass can travel, and we managed to meet it exactly. Three million years. I wish we hadn't. If we hadn't, I could go back again--" He stopped, and his jaw hardened.