Board Thread:General Discussion/@comment-27620479-20160914150718/@comment-26887879-20160914165701

Interesting observation. It is possible that Flowey decided just to hide his existence from Sans and make it look like Frisk is responsible for all the bad things he has done (even when they're fully innocent).

I think that Sans partially used Toriel's promise as an excuse not to attack you because he knows he can't really kill you. But, it still leaves the question, how did other kids die? It was implied that all of them were killed by Asgore, but why isn't Asgore as strong as Genocide Sans when we confront him. Did Sans know that Asgore was in despair during that time?

We never get to know the actual reason behind Sans' death threat at Hotel. Did he want to kill Frisk for Asgore and entire Monster kind or for his own personal gain? I don't like the way Sans was written. Almost everything about him and his motives are left unclear and unexplained. It's as if he needs some sort of DLC to explain his story properly (the irony is that Toby recently posted not to keep our hopes for that).

He only seems to make any effort to help you if you spare a person most important to him, Papyrus. He doesn't seem to care if you've killed all of the other Monsters before Papyrus. And it's funny how, back in the Ruins Flowey calls you out if you only spare Toriel for sparing the only one you're attached to. Sans needs the same call out.