Dragonflymagic answered Friday March 30 2018, 7:25 pm: Schizophrenia. My brother had that. I witnessed him even on medications, laughing and talking to someone who wasn't there and he saw things that weren't there.
The only other explanation could be of a spiritual nature, if the teenager was exploring for fun things of a dark magic or evil nature and having opened them self to having a bad spirit talk to and show themselves just to that person. I know some people think of this as mumbo jumbo and not real but there are lots of things we can't see that are there...like air, we can't see it, only see the effects it has on other things.
The way to know the difference is to find a true honest psychic able to deal with dark energies and see if the psychic can sense any thing like that hanging around the teen. If they sense nothing, then it is Schizophenia for which I suggest the teen seeing a professinal Psychologist. [ Dragonflymagic's advice column | Ask Dragonflymagic A Question ]
Attention: NOTHING on this site may be reproduced in any fashion whatsoever without explicit consent (in writing) of the owner of said material, unless otherwise stated on the page where the content originated. Search engines are free to index and cache our content. Users who post their account names or personal information in their questions have no expectation of privacy beyond that point for anything they disclose. Questions are otherwise considered anonymous to the general public.