I have some experience with this. It helps if you yourself have some marksmanship training, because you will choose to zig, zag, or continue along your current

I have some experience with this. It helps if you yourself have some marksmanship training, because you will choose to zig, zag, or continue along your current path based on a time scale defined by the amount of time it takes to line up a sight picture on a moving target. You'll want to throw off this fairly universal, homogeneous process and zig when the guy's got you in his sight, but before he presses the trigger, and certainly at the very latest before the round traverses the distance between the two of you. This can be extremely frustrating.