"Draco, you are not a killer..." Dumbledore said "You almost killed Katie Bell and Ronald Weasley. You have been trying, with increasing desperation, to kill me all year. Forgive me, Draco, but they have been feeble attempts ... so feeble, to be honest, that I wonder whether your heart has been really in it..." when Draco said nothing Dumbledore decided to chat "you have managed to introduce Death Eaters into my school which, I admit, I thought impossible ... how did you do it?"