Since there's magic and it's a JP story, there's OBVIOUSLY slave magic, killing them is a waste of resources! Who will mine all those random mines that apparently exist everywhere when a criminal needs to be forgotten?
I hope this hammer girl stays an enemy, I mean shes clearly hostile faction and so far completely unlikable, let her stay in character!
MC is true to his JP MC nature, just standing there looking dumb while other characters do things. Even if it's brutally murdering captured prisoners, JP MC still has to stand there looking dumb as such is his role.