Bertholdt weighs his options, for a moment; thinks about lying to Jean. He really has no idea how he got here, though, and he suspects that'll be quickly evident. Jean already knows the truth about him; he has no reason to try to hide anything else.

"I don't know anything," he admits after an extended silence. "I ... arrived here and you're the first person I've encountered."

A non-aggression pact was hard to believe, but Jean didn't try to hurt him first thing so it must be some kind of true.