The Doctor hops up, and follows Daine and Andrew, with the TARDIS at his side, and the mug still in his hand.

"Hmmm," the Doctor answers, thinking back. He was a bit. He doesn't want to discuss it out loud though, with the two others close enough to overhear. Instead he shares what he was feeling at the time - annoyance, frustration, disappointment. He's been generally trying to be friendly towards Andrew, yet the metacrisis has been very hostile in return, and it's hard not to feel unappreciated.