Draca is about to answer when she hears the footsteps. She goes still, all a rabbit under the watchful eyes of wolves. Except it isn't a wolf who steps out of the shadows, but rather a cat.

Or a woman that could well be a cat.

"Perhaps if you're planning to discuss mutiny, you should do so in your private rooms," McGonagall says, prim and proper and looking peaceful despite her words. "Or at least under a dampening charm."

She withdraws her wand from her sleeve and gives it a swirl and the pressure is there, making it clear that there's a silencing spell around them.

"Good evening, Ladies." She glances back to where the others are and then to the girls. "I will assume then you're not having a good time. Perhaps I could help?"