Board Thread:General Discussion/@comment-32182236-20190716003715/@comment-36453001-20190718174755

TheHumanAmbassador wrote: It's a canon. We observe it within the game, so it's canon.

It probably is a head-cannon, though. Ambassador,

https://vignette.wikia.nocookie.net/undertale/images/4/44/Sansanimated.gif/revision/latest/scale-to-width-down/118?cb=20181110100334

Other than head cannon, what would this guy attack you with?