hehe, first of all, the vehicle that hit him wasn't going exceptionally fast ... second, the cop was really on the ball to step out to where the open door was easier to bend/snap off rather than get crushed close to the door hinges (probably more luck than judgement) ... third, he clearly did a nice smooth martial-arts style backwards break-roll over the roof without breaking his neck against the windscreen and fourth ... he was very, very lucky not to have been squished by the other traffic.
If there is a God then he was certainly looking down on this guy on this particular day ;)
If there is a God then he was certainly looking down on this guy on this particular day ;)