Hermione changed in a moment. She appeared bright and alert, if a little weary. She picked up a brush and swept away a ring of salt that Harry hadn't noticed around the bed. An ancient form of privacy magic she'd cast around herself. Clever, Harry thought. He hadn't known she was versed in such techniques. But of course she was, this was Hermione Granger he was watching. Her underage magic would have gone unnoticed within the ring of salt, but what was that spell that had she done? Harry had no idea.