Snape didn’t look at her, but she knew he had heard her the moment she saw him withdraw her knife from his robes and immediately strike Lucius, both hands forcing the blade into Malfoy’s chest. Lucius cried out, but the sound became choked as blood began to spew forth from his mouth. Hermione watched as Snape released his hold on the knife, his hands trembling slightly. Malfoy fell backwards then, his blood immediately beginning to pool around him on the marble floor.