Emmett was just an lonely guy since nobody wanted to be friends or near someone that makes them feel uneasy. You couldn't understand why so you asked one of the persons who has been near him once "excuse me, why won't you be near Emmett?" And the response you got was "because he's an demon, when you get near him you can feel the spirits of the death and you can see the rotting skeletons surrounding behind him". You looked at the person and walking away with even more confusion then before.