Board Thread:General Discussion/@comment-10452902-20170507091901/@comment-10452902-20170507163713

Sans blantantly says that the player has been stopping timelines and creating new timeslines while as the player fights Sans so while he may not be sure HOW Frisk/the player does it, he is aware of it's existence. So he would encourage Frisk to reset and redo the pacifist run again. As for who the player is really fighting against, that is a tough one. On one hand, you have Sans who is determined to get revenge for Papyrus and everyone else but mostly Papyrus however, all his attacks are something only a troll king would come up with like Toby Fox. I think it's a combination of both.