She turns to him and takes his hand, shaking it was a smile. "Rose Tyler, simple Earth girl."

And defender of the Earth, Time Traveler, and probably several other things that she could come up with, but she sticks with that one.

Then confusion settles in, mixed with curiosity as she releases his hand. "Light assistance?" she asks. Although 'Yuuhi Ouendan' didn't make much sense to her, either.