You were sitting in potions next to Ron when Seamus Finnigan had come up to you, obviously flirting. He was repeatedly asking for your number even though you didn't want to give it to him. Ron noticed how uncomfortable you were and got up from his seat, standing in front of Seamus and you."Leave her alone" * Seamus had backed away slowly with a smirk while looking straight at you, that action seemed to hit a nerve in Ron and he punched Seamus in the face.*