Yeah, he's reminding her more than ever of her blue-eyes Doctor, like when they first met. But with a touch of herself in there. She wondered slightly if the Doctor would hate what had happened to her. That she'd become a bit harder, tougher, stringier.

Rose nodded her head and tried to knuckle his shoulders a little more to ebb out the tension, but it was like knuckling a wall, jeez. At a better time, she'd have to ask him what his workout regime was. She'd taken to doing running and gymnastics to keep in shape for her job, but that was definitely something else.

"Even just one person being alive changes the universe," she insisted quietly. "I know, because I made a paradox once. Endangered the whole universe. My friend was livid. It used to be his job to prevent that kind of thing, and he's the only one left that can. Well, and he thought I was just usin' him for it but--" she shook her head and bit her lip again, "Trust me, yeah? One person can make all the difference. Lots of people? And you're virtually unbeatable."