[Granted, most of New York wasn't Newt's fault, but Theseus is here to give him a hard time. It's something comfortable, at least to him, after the past hour being emotional for the both of them. Some light teasing is in order... along with lecturing.]

The majority of the damage lies solely on Grindelwald, but that doesn't leave you wholly innocent. Or are you telling me that your beasts getting loose in New York is someone else's fault? [He gives Newt a knowing sort of look, although, there's some fond exasperation in it as well. Newt will always be Newt...]

Can't believe you let that happen in America of all places! We both know how strict their laws are.

[Not that they could allow beasts to run around in London either, but.]