They claim the stabbed pilot came and opened the door for them while the other one was "trying to destroy the instruments in order to disable the plane", like he was just randomly smashing dials or something. Then the passenger that got into the cockpit dragged him out in a chokehold and the other passengers apparently tied him up "with his own zip ties and with the multimedia headphones", which is terribly convenient. Then the passenger flew the plane for a bit because he watches Air Crash Investigators, until another pilot appeared and landed in Tabuk.