The door knocker returned after mysteriously disappearing for a night. Word soon spread throughout the Castle, and many people speculated about what it had done during that missing night.
Its return delighted some people, however, and made others hang their heads.
For some Ravenclaws, the fact that theirs was the only one of the four houses whose students had to answer the door knocker's questions correctly to return to their dormitory made it an excellent measure of intelligence.
As for those who hung their heads, there was little need to elaborate. Every year, some Ravenclaws failed to answer its questions and were forced to wait outside for help.
There was more that could have been said about that, but it would go unmentioned here. There were more important matters.
In the Room of Requirement, Su Er took off the Invisibility Cloak and looked at Hermione.
"Tell me in detail. What feels wrong with you?"
"It's just... there seems to be knowledge in my head that I've never encountered before." Hermione frowned and spoke hesitantly.
Knowledge? Su Er blinked, and the faint anxiety in his heart immediately subsided.
He had experienced the same thing once himself.
"I think I know what's going on." A smile curled at Su Er's lips. "It should be something the Grey Lady gave you. That business about a legacy probably wasn't made up."
"Is that so?" Hermione hesitated, then nodded, though her brow remained furrowed. "There's something else strange, too..."
"What?"
"Look." Under Su Er's puzzled gaze, Hermione extended her hand, palm flat. Then-
"Whoosh..."
"Bang..."
"Clatter..."
A wooden chair shot up to the ceiling with a whoosh, as though rockets had been fitted beneath its four legs. After Hermione withdrew her fingers in alarm, gravity brought it crashing to the floor, where the entire chair