Something like the longest Vex I've ever seen... [He stares after it, putting a hand over his mouth. But then-]

You can't take your ship when you're out of temporal sink with it! It'll attempt to align with you and make contact with another version of itself and create a black hole to rival the Neverending Mountains! You're in such a rush you're going to destroy yourself and potentially a good number of people, depending on where you last parked.

[He can tell it's the Doctor's TARDIS (the key), but also out of his timeframe.] ...But she does still need soothing.