Mo really had every intention of leaving, but he also had a Ravenclaw brain that was trying to figure out The Mystery Of the Hufflepuff in the Hallway. So he sat down right where he crouched, in the middle of the hallway with his legs stretched out toward her. Olly, right? Or no, because she hadn't invited him to call her that.

She hadn't invited him to call her ANYthing, actually.

So why had she invited him to sit? "So." He was normally really excellent at conversation with strangers, but this stranger was unnerving. "What are you doing up here? Not hiding, I don't think, because you strike me as the sort who doesn't get seen unless she wants to be seen. This is a rubbish place to hide." He regarded her with open interest.