"Hmmm... he doesn't speak all the languages I do," he says. "Un-translation-spell him, ask him a really simple question in Draconic or vampire like 'Which way to the bottom of the world', then if he's me he knows to say 'Down', otherwise you're going to get something like 'what the hell?' And that's how you'll know if he either speaks the language or remembers being me well enough to get the answer. And if I'm still out here active, whether he remembers me or doesn't or what, have somebody be praying for a signal and I'll, I dunno, turn the floor purple. Would that work?"