Originally Posted by uz2bUSMC
So, you can not see any scenario where you would need to fire while moving backwards?
The idea behind walking backwards is to do it slowly and smoothly so that you can use the sights effectively and make good shots as you walk. One of the other things in the video is doing the same thing walking forwards.
The problem with doing both things is that your movement does not change the aiming process of you opponent, and he is stationary and so better able to aim and shoot than you are and your opponent might well be behind some kind of cover. This is a kind of mutual suicide pact with the odds more against you than for you. Moving backwards has the added disadvantage that you are in danger of falling over or bumping into something. Either thing makes your situation worse because it disrupts your firing process.
If you are being fired on your first tactic should be to make yourself a difficult target. You do this by moving rapidly across his aim and changing direction rapidly so that he can't get used to the lead he needs. Depending on circumstances, this sideways running motion can be angled forward or backward to get to cover or to flank his position. At close quarters you can run past him at an angle and curve round behind him. You have the advantage in this situation of knowing what you are about to do before you do it. He is always trying to catch up.
What moving rapidly means here is running and changing direction at full acceleration. The only way to do that without falling over is by running forward. Moving fast sideways or backwards just does not work!
If you can point shoot with one hand you can get off quite effective fire at the same time as running, depending on distance. At close range this has the great advantage that you can fire round the clock relative to your body orientation.