It was odd how he seemed to know her already. Maybe, in wherever his 'Smithton' actually was, people read minds. Or at least read character. There would have been a time when she would've thought that was impossible, but the Doctor had shown her that nothing she once thought would be was, in fact, impossible. Maybe he had some ability to read into the fact that she would hardly be caught in one place. And that she was more likely to do as she wanted than what he wanted her to do.
Besides, if she knew what he was thinking, she'd have told him she'd run off on her own many more times than just the end of the world. Nineteen-forties London was hardly the end of the world, no matter what Nancy had thought!
Rose dropped to the stairs, stretching her legs out in front of her as she smiled up at him. Partially because she was afraid if she continued standing, she'd do something embarassing again like hug him or touch him or something, and she'd already made him more than his share of uncomfortable that day. "You're too good to me," she told him, tilting her head to try and get a better look into those eyes. "For that, I'll spare you the responsibility of knowing I took off so you won't feel required to come rescue me. You can only do the Prince Charming thing so many times in one day."