[ She's close to saying if he were the only one left of his entire species, it might take a while for word to get around about Wrathion, too, but she isn't sure if the Doctor told him that part. Even if he did, it isn't her place to go around mentioning he's the only one—or supposed to be, anyway. ]

I haven't met many people who know what a Time Lord is off the top of their head. The Universe is infinite and never stops. I'm sure there's a lot more you haven't heard of out there.

[ Her tone is gentle, and she did not, in fact, elaborate on their relationship. She's going to just skip over that. ]