Eventually, Hermione’s parents came over and told her they needed to go. After she introduced them to Harry (he stumbled over calling them both "Doctor Granger", and Hermione’s mother laughingly replied that he’d just demonstrated why he had to call them Lance and Jane), they walked to the check-out stand; there were two clerks, but one of them was arguing with two old warlocks about whether the book they wanted to return was burnt or merely singed. "Ladies first," Harry said, and Hermione and her parents went to the other clerk.