Ron didn't really want to go anywhere - aside from bed, maybe. The size of the task kept getting more and more overwhelming, and he knew it would be easier to cope with if could just ... sleep on it a while. But things did move too fast, for that. Anyway, there was no point in trying to turn in after having spent what had felt like an age breathing the same air as Mundungus Fletcher, creepy bastard. Might as well walk it off.
"Have we worn out our welcome in the library, yet?" He probably had - he was only ever really there to make too much noise talking to Hermione, and the glares he'd been getting from Pince, no friend of his, were becoming worse and worse.