A snake-shaped Patronus. Talking in Zabini’s voice. A few feet away, she saw Draco rubbing his eyes. He had somehow managed to sit up, despite his pallor and being so drenched in sweat himself that his hair stuck to his forehead. Slowly, painfully, she started to understand what was going on. It seemed that Zabini was communicating with them in real time with the help of his Patronus.