Board Thread:Questions and Answers/@comment-27411407-20151216215702/@comment-26928805-20151229181844

Cheetodust wrote: The tipping point isn't NEO- it's the last random encounter of Hotland/CORE. Mettaton NEO in a Genocide run (he still appears on a neutral as long as Undyne the Undying is killed, I think) cannot be spared. Well, the neutral NEO can't be spared either but you get what I mean. Once you make the decision to spare or kill, that's it. He cannot be spared, but if you do not try to maximize your attack at all, he notices that you held back and thus Frisk regains enough measure of control to end the genocide run.