I would hesitate to say “psychosis is just like that,” but it’s can be. Not everyone suffering from psychosis is going to kill someone. Often they are more a danger to themselves and also pretty often victims of abuse themselves. Of course this particular situation looks like it could be dangerous, so it’d probably be a good idea for them to be admitted to a hospital. I still sometimes have psychotic episodes, but for me it’s often that something is coming for me. Nobody to kill or hurt, just some inexorable cosmic force coming to get me. I dunno. This is probably a case where they’re dangerous, but I don’t want people to assume this is what psychosis is always like.