Board Thread:General Discussion/@comment-4504826-20160426040035/@comment-26814804-20160427001109

Yossipossi wrote: Stevethebarbarian wrote: Like I said, it has nothing to do with harming a monster, it has to do with the willingness to kill. If you spare them, then it couldn't be more obvious that you aren't willing to kill them. Right. So why do you get LOVE for "sparing" Sans?

Checkmate Because you hit him, you chopped off his 1 HP, and you didn't know that he was going to ecscape. You landed the final blow, and therefore you were willing to kill him. However Sans survived, if he did survive, after all, Chara and Frisk weren't planning for him to do so, so it still counts as a willingness to kill.