I see it like this: the best outcome for humanity is for both armed passengers to shoot each other — the innocent pilot gets away. On the other hand, the most favourable outcome for my survival is to shoot the other armed passenger and hope he shoots the pilot — I take the parachute and live to commit more murder. A third option is if the other passenger is you, Tim. In that case I’d definitely shoot you first, logic be damned. Whichever way it plays out, the best outcome for me begins with me shooting the other guy!