Very nice split screen video.
Start watching screen A (7 seconds). You'll see him point at the officer pulling up in the car. Switch to screen C (9sec), the first officer seems to be in trouble (ie the 'gun' gets pointed back at him). The officer that just stopped comes out of the car shooting right away to aid the first officer (2 shots). He sees the threat has changed and stops shooting. Switch back to A (11 sec). They follow the guy while keeping aim. He turns as if to shoot, the left cop ducks and fires, the right cop opens up, and they dont stop until he's down.
The shot 'counter' seems to make some points as well. It seems to me the officer on the right has had more practice shooting (or at least did better in this situation). By the time the officer on the left fired his second shot (4th overall), the other officer had fired 4. His 5 shots were quick and evenly spaced. The left officer (holding the gun with one hand) fell out of rhthym after shot 4 (6 overall), and took awhile getting the last one off. Thus, the gap between 6 and 7 and why 7 was a little late.
So the officer on the right fires 5 shots and stops, the other officer is late in the game and still trying to get back into rhythm when he realizes they've fired enough.
Oh well. I've been viewing the video for quite awhile, whereas they had about 6 seconds in real-time and it was their life in danger.