William blinked and looked up. It was the mysterious man again, and suddenly the facts clicked together in a sensible way.
"You must be the new Divination teacher," William said, quietly with respect for the students now slipping, hushed and hardly whispering, into the stacks. He shut the book - the damned dust was practically everywhere now - and almost smiled. "I can't think of anyone else who would voluntarily offer information about a topic usually studied only by fourteen-year-old girls and romantics."