"Yeah, actually." He mentioned having a brother, and thus - this is said brother. If he can remember his name - "Richie, right?"

Small world. But that's actually turned out to be the case anyway, hasn't it? Wonderland isn't really big enough to allow for anti-sociability, and the pool of people is limited enough for it to be inevitable, frankly, that he'd run into someone else who knew the same people he knew.

Including, apparently, Seth's brother.