Board Thread:General Discussion/@comment-27524978-20160210030742/@comment-28032544-20160401041000

Mabian wrote: Uh, that blue attack line goes away in a standard Genocide run as well. If it's your first time playing that route, he says that you're going to have a bad time if you continue the way you are.

Even the change in the line is perfectly consistent with Sans having only a vague sensation of what happened in another timeline, just as Toriel remembers your preference for cinnamon or butterscotch. He simply knows that that vague sensation isn't a random occurrence.

For reference, the change you pointed out: https://www.youtube.com/watch?v=suB9ykM4da0

I think your example actually disproves your argument. If he has little to no knowledge of past timelines, as I said, he wouldn't be able to easily distinguish between neutral Frisk and no mercy Frisk, unless he actually knew Frisk enough to read their expressions. He said outright that Frisk looks expressionless, and not like a axe-crazy murderer. The fact he's that violent with a child that might possibly just be stoic when you're on a merciless path is evidence that he knows exactly what Frisk's supposed to normally look like, and what's about to happen from past timelines when Frisk's stoic. Considering he's not half as bad in a neutral run, that's not his personality type.

As for him not remembering exactly what happens... Well. No one's memories are perfect.

Specially when it sounds like he's depressed and apathetic to the outside world, always asleep somewhere, it would make sense for him not to have perfect memories of anything. He points out he finds it hard to give it his best when he knows everything's going to be reset. Why would he put the effort on remembering everything when he knows his memories might be rendered obsolete soon enough?

As for the fact he stops counting eventually... He started counting at first to taunt Chara. I would assume that reset after reset after reset, he might still be physically rested, but mentally exhausted of fighting again and again. He would just get sick of taunting Chara eventually, and start to despair instead. He does sound irked when you kill him and reset to fight him again. I would assume that experiencing death then being brought back to life to be killed again would pretty much kill his humor, and indeed, he doesn't make a joke then, just insults you.