Fight fire with fire
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The only way they can deal with crime is to fight fire with fire.
If someone attacks me by bringing up problems I had in the past, I'll fight fire with fire and do the same by finding out things about their past.
Marshall: Bro, Ray keeps talking shit about you.
Jordan: Yeah, I know. I'm about to Fight Fire with Fire.
Marshall: And how are you gonna do that?
Jordan: By kicking his ass.