[Colin confronts Billy on the rooftop] Costigan : Freeze! [points gun at Colin] Sullivan : Hey! Hey! Hey! Costigan : Put your ****ing hands up! Sullivan : Put the ****ing gun down! Put the gun--put the gun down, alright? I came here to talk some sense into you! Costigan : Hands! Sullivan : Alright! Just act professional. I can get you your money! Costigan : What'd you say? Sullivan : I can get you your money! [Billy pistol whips Colin, knocking him to the ground] Costigan : You didn't come here to talk, alright. You came here to get arrested! Sullivan : You got ****ing tapes of what? Costello was 'my' informant. I was a rat? **** you! Prove it! He was working for me, he was 'my' informant. Costigan : Shut your ****ing mouth. Come on, get up! Sullivan : Whoa, what is this? A citizens arrest? Blow me! Alright. Only one of us is a cop here, Bill! You understand that, Bill! No one knows who you ****ing are! Costigan : Would you shut the **** up?! Sullivan : I'm a Sergeant in the Massachusetts State Police! Who the **** are you? I erased you! [Billy slams Colin onto the building] Costigan : You erased me, huh? [Points his gun to Colin's head] Sullivan : Yeah, go ahead! Shoot a cop, Einstein! Watch what happens! Costigan : What would happen is this bullet would go right through your ****ing head!! Sullivan : Watch what happens! Costigan : What, so you can get the parade, huh? The bagpipes and bullshit. **** you, **** you! I'm ****ing arresting you!! Sullivan : That is the stupidest thing you could do! [Billy punches him three times] Costigan : Shut the **** up!!! [Sullivan falls to the ground] Costigan : I could give a **** if the charges don't stick, I'm still ****ing arresting you. Sullivan : [Dazed] Shit.

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