"Severus is to help you, Draco," Narcissa said. "The Dark Lord told me to go to his house, and have him swear the unbreakable vow so as to protect you in your quest."How many times, mother," Draco spat, indignant, "I don't need help! I can do this."The Dark Lord told me, it was entirely his idea. He is expecting you to fail, Draco. He reassured me, saying if you were not to do it, the task will fall into Severus" hand, it will become his burden, because the Dark Lord does not completely trust him, see? In fact, I think he'd prefer it if Severus did it, that way he can be sure about him as a loyal servant."