If any conspiracy theorists wish to test out the scenario, I'd be happy to shoot at them from that window whilst they drive along slowly in a convertible with the top down.
I vaguely remember seeing some news crew actually tried to simulate this. Does anyone have the details?
I doubt we'll ever know the full story on this. There's about as much chance as Harold Holt cruising up the Yarra in a Chinese submarine to apologise from being away from parliament for so long.