Regulus hasn't ventured into the non-magical books yet, partly because enough concentration for reading has been slow to come back. (The other part: He knows he's going to be lucky to make it five pages at a time without loads of context questions.) Still, the runes reading is interesting enough to keep him occupied, when he's awake enough to need the distraction.

"I am. Is someone here?" It's the most logical reason she'd be asking out of the blue, though he's not expecting the answer to be yes. It hasn't been so far; why would anyone else turn up now?