The gunfights in this movie...
are the worst I've ever seen. WTF is going on? What was the director thinking?
"ok everyone just stand in a circle and shoot at eachother, don't worry no one gets hit"
They're very badly done. They just showed a SWAT guy watch a can of tear gas roll all the way across a parking garage and end up right in front of his face, stop, and explode. The whole time he just crouches there, obviously so the director could have a 'cool' shot of the reflection of the can on his face mask.