"Mmm-mm?" She slides her gaze up to him as she follows him across the street, stubbornly ignoring the city's oppressive hustle and bustle, none of which should be here. "And what did they witness?"

Her pronoun correction is subtle but pointed. She is not enjoying the TARDIS' insufferable holier-than-thou attitude, but they are clearly similar entities, and she won't lower herself to Durant's level of disrespect. She's better than that.

And if he ever tries to call her an it, well. There are ways of dealing with rude creatures. Even, she hopes, whatever kind he is.