"It's not always that it appeals---it's more that it becomes necessary, or people will die. Believe me, I wish peaceful solutions were more common."

Billy rubs at his arm. "And no one really knows what they're like," he says secretively. "There's a rumor going around that they're aliens too---a group opposing the invaders. They could be a secret military project, or even the work of an eccentric billionaire. But the important thing is that they always bring kids to safety and stop the destruction before it kills people."