The Psychosis of Watching Yourself Die

I was trying to wrap my head around that film has a lot of themes and is complex, but is also kind of right there on the surface in a way. Is it the psychosis of watching yourself die? I don't know why I was thinking about that, but it was a while ago. There's a an interesting tradition of philosophy that just deals with personal identity and what it is for one thing to be a thing and specifically a person. It might not be a scene, but there'll be some idea that I kind of get fixated on and then I build my characters out from that and the narrative out from that.