You two were enemies. But you were good friend of Scott. Stiles throw a party at his house, so Scott invited you. You were actually having a good time. Then, Stiles’s father come in, drunk.

“It’s you Stiles.” he say drunk, pointing at Stiles with a beer bottle in his hand

“You killed your mother. You hear me?” he said. He was too drunk to realize what he was saying. Stiles had tears in his eyes

“You killed her… and now you’re killing me.” he said and throw the bottle on Stiles, but luckily he managed to dodge it, covering his face with his arm, looking at his father with tears