The first thing that flashes into his mind is that there is probably no way in hell she could accurately mimic how he talks. Oh, the bulk of his casual everyday conversation, maybe, but when he plays with sound and emphasis and vocabulary the way he did in their very first conversation - no. It's too him. She could produce an imitation, but it would not be the real thing.

For that matter, he's not sure she could move like he does, either. Muscle memory is on her side there, though, and it'd be harder to judge.