Talk:Sans/@comment-28661267-20160306232345/@comment-27448264-20160403050628

I mean KR is basically implied to stand for "Karmic Retribution" so you can infer that its effectiveness hinges on how evil (or in this case, how much LOVE) the target is. Maybe that's why Sans never bothers to step in 'til the Genocide Run, when the factors for his victory are most in his favor due to Chara's massive killing intent.