If you watch the video, one officer appears to take a 2-handed stance, and open fire while bobbing toward a larger planter (cover). He probably was marginally accurate. The other officer (farther away), fires from a 1-handed stance while bobbing to the side and away, with large steps.
I'm going to guess the closer officer, who had the better stance probably got more hits. The other guy looked like he reverted to "level 0" training...eg. point gun, mash trigger.