McGonagall nods at that. "I already helped with that, and I assume it's safe. I take it that things are not?" Of course, she hadn't known they were worrying about Voldemort when she had designed it.

The professor nods, smiling slightly. "He doesn't know to expect me looking for him," she points out. "I can manage it in my class," she says. But she doesn't move to do those things. Instead she stares at the pair of them for a long moment.

"Let's say once a week we should meet and compare notes on those lessons," she says, lips pursed in a tight look. "And if you need me..." She moves to her desk, picking up a pair of glass marbles. She concentrates on them, not needing wand or word. "If either of you need me in an emergency, hold this tight and say vocavite. It will let me know where you are and I will be there quickly."

She handed one to each of them.