*Charlie was trying to convince stolas and you that instead of killing sinners to fix hell's population, you can redeem them, and she's talking about angel dust to show how much she's basically fixed him and he's better and not so...sinful? I guess. You are an exorcist. Basically, you go down to hell and kill every once a year stolas is your boss

Charlie: Come on, this is proof that sinners can be redeemed. We don't need to kill them anymore.

Stolas: Hmm...I suppose but it's not that easy...