Without thinking, he grabs Harry from behind, flexing his muscles to pull him away from Draco. But it's not as easy as he thought; Harry struggles doggedly, trying to break free of Scorpius" grip with his hands and teeth so he can punch his father once more. An inhuman force seems to be driving him, and when he manages to pull him back two steps, Harry squirms and sinks his teeth into Scorpius" forearm.