A friend of mine had the theory, that this whole school is just a big SCP test chamber, but nah, that’s probably not going to be it. The only theory I have is that all of them are demons that can‘t control theirselfs, they probably didn‘t even want to kill so many students. (Not sure why the police is taking so long, tho.) And Viktor is probably like that, because he got badly abused by his mother, who could be the grandma ghost. Those are my theories right now.