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This person is a total beast who hangs with you like a brother, but if you mess with him, he'll rip your head off and use it as a football.
My cousin's a friend of the enemy. He's been hanging with me since we were kids. Last week he saw me throw my dog off a bridge. Now he's coming for me.
That guy at the gym is a friend of the enemy. He smiles at me, but I know he's plotting my doom.
My friend's a friend of the enemy. He stood up for me when I got in a fight. Now I have to stand up for him when he gets in a fight with my dad.