I don't mean to be rude but can you guys stop talking about this? I know it's during genocide and it's more serious but first of all, basically no one else bleeds, it's dramatisation for the genocide route that's why. Secondly, papyrus doesn't bleed so no excuses about the whole 'bones make blood' thing. Lastly, Sans is Ness was a joke theory that people took WAY too seriously, Undertale is filled with earthbound references (including megalovania because it originated from a earthbound halloween hack that Toby Fox made) and that's that, no ifs, ands or buts. Feel free to go against what I said but I guarantee there is a way to disprove anything you say (except maybe sans having determination... maybe).