"He sort of had to," Neville revealed. "After I caught him transferring his sister's soul from one ageing goat to a younger foal. You remember those inappropriate charms he was prosecuted for? That's what they were. He kept Ariana's soul in a living creature, as she was too ashamed to cross over to the after life. She felt responsible for the lifelong row between her brothers and that she didn't deserve to move on without making amends."