To be quite honest, Guzma chose his victim at complete random. He has plenty of anger to vent so why not, eh? Though he's surprised how smoothly it's going.

But what does he do now, exactly? Anything he wants? Fuck if he knows what that is.

Other than being a dick and not doing what's demanded.

"Why don't ya try working ya way out instead? That's more interestin'."