I think Patrick Jane is Red John, the trigger is the red blinking light on a live camera. That is why he hates being on tv. Cos all the encounters he had with red john or red john related was on his own, the team always arrives after and he just relays what happened. Maybe Kristina couldn't speak cos the monster was right in front of him. I mean he already got away with murder once. In the flashbacks of boywonder we see that he didn't want to fleece that dying girl but he cant help himself.