I decided to not talk to the pyro, instead went to the spy and medic to ask how much they know about this person's mental stability. Both confirmed this pyromaniac is a schizophrenic psychopath. So, let's count: Pyromaniac, schizophrenic, psychopath. Those are three mental illnesses, and all three are baleful.
So this was a bit new for me. I wondered how is this person even allowed to walk on the open, and not captured in a camisole, and drugged daily with medicine in a mental hospital.
I still tried to think positively. They were capable of fighting very well, so maybe its not that serious. One thing for sure, I can't talk to this person, like how I want to.