I'm more curious on why there's two pens thou. Separating the people who don't want conflict and such from those who got away with loopholes?
I'm quite certain that the pens are an allusion to Christian eschatology, in which "All the nations will be gathered before him, and he will separate the people one from another as a shepherd separates the sheep from the goats."
Being forced to go to church and read the bible as a kid occasionally has it's uses in "literary analysis" lol
The people he sent to hell this chapter seem to be only those that were present and participated in his execution. That leaves those who didn't participated in his execution, who can either be good or bad in the eyes of Raoul. And so he separates the remainders into two groups, like "a shepherd separates the sheep (good people) from the goats (bad people)."
NB: Even if Raoul deems one group good, they still might be in for a bad time. While he could take them to some form of paradise, I wouldn't be surprised if his idea of just mercy is
slightly twisted, all things considered