Digging deep into his Gryffindor courage Harry said "I was him and he was torturing a students father, Isobel Stevens, she’s in Ravencalw. He’s going to use Polyjuice to become him and go somewhere... also, there was Malfoy... not Draco... his father... he’ll be taking him and Rookwood and he mentioned someone called.... Pius... He wants to see him..." Harry finished winding what scared him more Voldemort of a raging McGonagall