The Doctor turns at the sound of the TARDIS materialising and frowns... deeply. He doesn't recognise it. And he should. He's a Time Lord. When the other man steps out, the Doctor's frown deepens.

"Time Lord. But not any I've met..."

Which isn't actually saying much. He just is that haughty. It's well-earned, he never quite stopped being Lord President.

"No. She... It happened before I got here."

She was just the one he was always asking about. He smirked down at his guitar. "Thanks. It keeps me fed and sheltered."

Since he's without his TARDIS, that's a big deal.