Their shots apparently hit the apartment above. With a breaching entry and an unknown target, random positioning in the horizontal plane may be expected but in the vertical plane it is definitely not. That suggests that they were holstered when they kicked in the door. Further, the gunner shot once and hit while the "police" shot many times and only managed to hit his girlfriend which suggests that they were much more panicked than someone that was asleep 1 minute before the encounter started.

what does the evidence look like when the police decided to rob you?