"The day's young, I think." Is this still part of Earth? Or is this...a whole other world entirely? There's a lot that he's going to need to learn, and he isn't convinced that he won't be going back, to the foster family that will decide he's too much of a handful, to the system that's just waiting for him to age out.

"Aw, c'mon, I've got this stuff I'm carrying; you'll beat me in a straight race." And he's not letting go of his stuff if he doesn't know where it's going. "You've got those long legs going on." Long everything and probably still growing.