Talk:Napstablook/@comment-122.150.72.205-20151002152554/@comment-73.206.173.11-20151022020501

I think it's possible for some in-game sources to be mistaken. The "humans cannot use magic" thing wouldn't be the only in-game error a character made (I'm not going to call Papyrus out by name on this). It's likely not something humans can do easily, so a monster looking at a human can safely assume that human's got no magic.