Talk:Sans/@comment-76.78.240.209-20151117045618/@comment-187.178.229.141-20151117210707

I don't think he can time travel but his hability is more like teleportation and he is also very perseptive, that's how he knows when something is out of place in the timelines.

I think what happend with the key to his room is that when he whispers you the second password he must had to lean over you to whisper and then is when he placed his key in your keychain. That is why when you speak to him for the 3rd time he doesn´t gives you more passwords and just believes in what you say because the key he placed is there confirming his suspicions of your time traveling habilities.

Also I do think that Sans may have never spoken with Gaster or at least if he did it was not for much time. Some of the citizens in Hotland say that Gaster "fell into his creation" and disapeared. Asgore then contacts Alphys to do the scientist job but she doesn't appear to know about the timeline issues, which was the main study topic for Gaster, which is odd considering she created Flowey which would have happen after Asgore already had 7 souls considering Alphys has never seen a human before Frisk. Also Sans never refers to Gaster at any point and when you confront him he mentions Gaster's work (the blueprints) but he refers it as something he has been studying.

The key here I guess is how old is Sans and how long he's been stuying the timeline.