He pointed his wand at his throat, and said, "Sonorus," he took a deep breath, "QUIET!" Everyone jumped, shocked into an abrupt silence, "Now - sit down, all of you!" He boomed across the room, "No - not on the chairs," he said when a few of the group tried to peel off towards the classroom, "Exactly where you are - on the floor. Cross your legs, all of you. And shut up, until I say you can speak," they all exchanged nervous looks, and one by one did as they had been told, sinking to the floor and crossing their legs.