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 as incompetent and places Hagrid on probation. Although Dumbledore is unable to prevent Trelawney's dismissal, he invokes