The three kids continue to fight, and it looks like they're about to kill each other. The kid who controls the wind is about to die, so he's about to do battle with the other kids, too, when he hears a "woop" and a "swoop." It's clear that the kid is trying to kill the other kid, and he wants to make sure he doesn't get the last laugh. He wants to kill both of them, but he can't, because he can only control one group of kids at a time. So he offers to let the kid go for free.
The three kids continue to fight, and it looks like they're about to kill each other. The kid who controls the wind is about to die, so he's about to do battle with the other kids, too, when he hears a "woop" and a "swoop." It's clear that the kid is trying to kill the other kid, and he wants to make sure he doesn't get the last laugh. He wants to kill both of them, but he can't, because he can only control one group of kids at a time. So he offers to let the kid go for free.