In Undead Nightmare, Roscoe can be found defending Gaptooth Breach, where he inside the mine. If Gaptooth Breach is saved and Roscoe survives, he will move to the shaft tower along with Harlan Forbes.
Quotes
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Where do you want me to get you? Head shot's the quickest!
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āRoscoe Duffy
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Ain't no scuzz like you gonna kill Roscoe Duffy!
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āRoscoe Duffy
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D'You like breathin' heck fire? You're gonna have to learn!
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āRoscoe Duffy
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Is it wrong Iām enjoying this?
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āRoscoe Duffy
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Them corpses is ours! Stop that wagon or you'll be joinin' em!