Hermione was glad she hadn't asked more questions about what it was Harry had to come to Hogwarts to do, but she didn't think that luck would hold out, so she forged on. "There needs to be a plan to get the lower forms out of Hogwarts, and anyone else who won't demand to stay and fight. But they can't just start leaving now... or we'd be found out. We'll have to give you a signal and then they'd have to go right then."