Talk:Sans/@comment-27866698-20151124191318

I have a theory:

Let me explain. Sans is implied to have been a scientist or researcher of some kind, right? It's been established that he studied the timelines, time travel with the strange machine (which would act as an artificial save), teleportation (although that might be an innate hability), the save feature, humans in general and human world, determination, the code, etc, and worked with many people in this matter (maybe even worked with Gaster).

What if he, in the name of science, was the cause that killed all his team and friends unintentionally. He has travel back in time (used the artificial save feature), and this can be confirtmed by himself when he says "look. i gave up trying to go back a long time ago." and "''you'll keep consuming timelines over and over, until... well. hey. take it from me, kid. someday... you gotta learn when to QUIT." ''He went back so many times curious of the different outcome of the timelines that he just came to a point of no return where the outcome being loosing his friends and maybe his (probable) mentor. "we'll never see 'em again".

Also he learned that if he kills a human they will just come back because of the save feature and more decided than ever to kill whatever killed them in vengance. That fact, the promise to Toriel to protect the fallen humans and Papyrus' point of view "there's good in all people" made him come to the alternative to be friends with any human that exists the ruins to the Underground so maybe they if they messed up in their journey they would want a better outcome, reset and do it all over again but from a "let's do the things right" perspective.