When Seamus mentioned his father Ambrose grabbed his wand and pointed it in his direction. "You," he said, trying to keep his voice steady. "Really ought to watch what you say. Keep opening your mouth, and who knows what'll happen to you, or your friends. By which I mean the ones here, who chose plants over their own sense of self-preservation, and not the ones chasing after a lost cause in the real world."
Shooting a spell at something just over Seamus' shoulder he glared. "I know you think you're all important because you're a prefect, but I'm one too, and I'm on the IS. Which means that I've got more power than you. Which means, watch yourself."