From some Brazilian Police Department:

So exactly what they are trying to demonstrate & teach? How aware they are and how cool is the training cadre that the can walk in front of the shooting students confident that they won’t get shot?

This thing for me are nothing more than cão e de pônei shows. I fail to see what kind of advantage you have by shooting and very likely not accurately while two morons stroll back and front of your line of fire.

• The shooters were more likely keeping a corner of an eye on the instructors as they shot rather than placing the bullets where they could do damage to the targets.
• If you are the kind of person that goes “There is a firefight! I think I will stroll in No-Man’s Land and check it out” you deserve your gene pool to be thoroughly bleached by assorted projectiles.
• This kind of stupidity is contagious. Other people get the wrong idea and think “Dude, this is the crowning achievement of being tough!”…and end up with unexpected holes.

It is all about the basics, not looking cool. Looking cool makes for a great looking corpse.