"Well you were a nasty little boy who had been calling me a Mudblood all year, it seemed fitting’ she shrugged, "anyway we decided to Polyjuice into Slytherin’s and come down here and try and get you to talk. Harry and Ron transformed into Crabbe and Goyle and I was meant to transform into Millicent Bullstrode, but I must have got her cat's hair because it went awfully wrong’.