Theo’s waving his hand in front of my face. I don't know where it comes from but I’m on my feet and I grab his shoulder, push it back and punch him. He flies back in a way that a wand may have been able to justify. I’m leaking magic like a child. Blood is pouring from his nose. The common room is dead silent. Theo is wiping his hand across his face and when it comes away bloody he looks up at me "What the fuck, Draco?"