"In the cafeteria? No. Thanks. I'm fine." She had her wand, and she was allowed to come and go as she pleased, apparently. Clearly security was shamefully lax. Nothing was really preventing her from doing just as she wished when it came down to it.
Harry smiled coolly at her observation about the sorting hat. "True enough. I asked it to put me anywhere but Slytherin, and it obliged me. Not that I was qualified to make that kind of assessment at the age of eleven, but there you have it." He didn't need to keep her talking forever, but there definitely seemed to be the occasional interrogative feeling to their exchange on both sides. "Well, shall I leave you to your reading, then?" he offered.