Brown: Put down the gun and step away from Sergeant Sullivan!
Billy Costigan: Look, I called you. You specifically. You know who I am. I'm not gonna shoot. I told you to meet me downstairs.
Colin Sullivan: Help me.
Brown: PUT THE WEAPON ON THE DECK AND STEP AWAY FROM SERGEANT SULLIVAN!
Colin Sullivan: Shoot the fuckin' prick already!
Billy Costigan: Where's Dignam? I told you to bring Dignam!
Colin Sullivan: Shoot the motherfucker!
Brown: Put the weapon on the ground and we'll discuss it.
Colin Sullivan: SHOOT THE MOTHERFUCKER!
Billy Costigan: Look, I got boxes of tapes, evidence, all of that! I got proof! He's Costello's rat!
Brown: Maybe you do. But right now I need you to put the weapon on the deck and step away from Sergeant Sullivan!