He'd heard a lot of governments, monarchs and orders being overthrown. It didn't happen much on Dathomir, this 'cutting off the head of the snake' idea, but it was actually well taught as a legitimate form of combat. Assassination created power vacuums other leaders would exploit. The Nightsisters could be lent out as assassins after all.

"And I expect he was a harsh and unpleasant head of the government? Is he the reason that you have developed your unique skills?" After all, she could travel at will, which otherwise apparently required a god. He also knew she had other skills she didn't talk about much, but the hints were there.