"Manhattan? But you're a...a...a...tortoise!" He remembers that much biology. "A large, sentient bipedal tortoise."

Give him a minute to let this sink in. It's probably bad that he'd almost rather it be a hallucination.

"Are you like...an escaped experiment? Or from some Superfund site? Or Three Mile Island?" Or...something? He is still a scientist: he has questions, friend.