Umbridge’s arm twitched again, and Draco pushed Harry further behind him. She released a shuddering breath, and said dangerously, "One hundred points from Gryffindor and Slytherin, and detention every night this week for both of you - but be warned, when I am in charge of punishments, I will take more than points from you," she turned on her heel, and marched from the hall (the students who had stood to peer over the heads of their housemates quickly seated themselves as she passed).