Mary stood, watching him, arms folded and one eyebrow up and was about to ask him if he was lost when a door appeared.
She blinked. But by this time not much surprised her anymore when it came to Hogwarts. She waited until he pulled open the door then stood, looking into the quiet room which looked, oddly, like the room they'd been in before last year, down to the dust on the floor and the decrepit smashed furniture. There was even a chess board on the ground, with the pieces arranged on it.