Now that does come as a surprise, and he fails to hide it. He had no reason to assume there were no Doctors about, besides past misadventures, but it had seemed such a reasonable expectation he hadn't questioned it. Definitely something to look into later--stranded, potentially vulnerable Doctors.

Her assessment is a little too accurate for his liking, and he bristles. Literally, for once. "What, are you empathising? How disgusting. If there are Doctors about, why are you still here? You'd never manage on your own, but I'd hardly expect the Doctor to stay put for long."