"His master -- well, the being who used to be his master -- was allied with the Lone Power, and sacrificing mortals to gain power." There's a hint of distaste in her voice as she continues, "Plus, he was trying to get Puck back in his service, so he kidnapped some of Puck's friends. So a group of us went to get them back, and I laid a geas on him so that he can't work with the Lone Power again."