How do I make the slaves brake free when I am evil and want to strike down the rebellion?

I know how to do it if I am good and want to free them, but this time I would like to kill them!

i don't think you can put down the rebellion, you can either cause it or not cause it. My suggestion is cause(cause how's it hurt you, hendak's a jerk and these slavers attack you in the street mine as well bring them the pain)

If you don't like those slaves, talk to Lehtinan after Hendak asked you for help.

No spoilers allowed, let him play.