Harry felt as if Devil's Snare was rooting him to the spot. He couldn't move a muscle. Petrified, he watched as Quirrell reached up and began to unwrap his turban. What was going on? The turban fell away. Quirrell's head looked strangely small without it. Then he turned slowly on the spot. Harry would have screamed, but he couldn't make a sound. Neville seemed to have no such issue as he let out a loud scream.