Gryffindor Quidditch team. She is also intensely bigoted , harbouring deep loathing for "half-breeds", such as centaurs , werewolves , and Rubeus Hagrid (a half- giant ). In short order, she dismisses Sybill Trelawney , the Divination teacher, as incompetent, and places Hagrid on probation. Although Dumbledore is unable to prevent