Carla let a full minute pass after Nina had exited the building, then signaled to Trevor. He descended on the escalator, then rushed up to the guard who stood just inside the lobby. Carla couldn’t hear what he was saying, but she knew the script; she’d written it. He was tearfully asking the bored-looking guard who manned the scanner if he’d seen his mother, whom he had lost at the end of the tour. As proof, Trevor showed the badge his mother had "dropped" during her ride down the photon slide.