Ok, I've been trying to locate a line that I heard the sith warrior say, though i doubt it's exclusive to them. I was watching a playthrough of either KOTFE or KOTET, when I heard the warrior say 'show/give them no quarter." Idk why, but it stuck with me. Could anyone tell me when this is said ? Really random, but i would appreciate any help with this.

It's probably in the intro to KotET Chapter I, when you are about to exit the shuttle onto the surface of Voss, and it may depend on which options you pick in the conversations.