"Either they stayed behind or they're one step ahead," Ravi says, because that's about the only options that he can think of. "No, wait,' he amends, "There's a terrifying third option in which they've been moved by our evil overlords." The reason he doesn't like that one is because it doesn't help him in the least.

"I need their brains," he confesses to Helen. "I really didn't want to have to go around hoping for another tragic accident, but they're not here and I'm back to square one."