John squints at Ianto, then sighs and snaps the bottle closed.

"Because I don't want you to burn and you don't have a mirror but you know what? Fine! You do whatever it is you want to do, Ianto. I was just trying to be nice --"

But apparently he can't do anything right, so what's the point in trying. He shrugs his bag aggressively back onto his shoulder and starts walking again.