video shows how john moynihan , 34 , was shot within seconds of opening angelo west 's car door .
west , 41 , immediately jumps out of the car and shoots the officer .
video then shows west shooting at officers as he runs across the street .
west was fatally shot by moynihan 's colleagues during the shoot-out .
police said they released the video to be transparent with the public and tamp down rumors .
moynihan was released from the hospital friday after weeks of recovery .
police said his current condition is ` serious but improving '