"Because I'm not a coward." He answered hoarsely. He would never admit to noticing the dark spell holding him to the ground. "Tell me about yourself instead. You have enough courage to kill me, but what will you do when they investigate my death? Someone in Knockturn Alley will speak up, perhaps in exchange for a reduced sentence. They've seen your face, they've heard our conversation. The Aurors will investigate and they'll know it was you. Doesn't all this worry you?"