I saw a really good video this guy made. It was a training session for first responders to people in crisis. So excellent! I felt like I understood psychosis better after watching it. I'll have to see if I can find it.

ETA: I found the link to the talk, but unfortunately it's not working now. He does have some videos on youtube - Schizophrenia Blueprint. He presents the sz being a biochemical imbalance in the brain - which I don't think the medical "experts" even accept anymore. Nevertheless I find his insights into psychosis and how to deal with a person in active psychosis to very useful.