Draco gave her a subtle nod before all but throwing her to his mother. Hermione didn't have to fake the stumble. It seemed, she realised with a pang, that the adrenaline from earlier was wearing off. "Don't let the elf live," She whispered," We don't know how much he heard." Her strength was slowly leaving her but she had just enough to slip the knife from her pocket and into Narcissa's limp hand.