This reminds me my economic studies, when professor was telling us: -Here is the math, but you have to undestand that it works only in conditions of perfect market, so you need to know them only to undestand principles, but real perfect market is not possible. Looks like same with the math application in this case.
Show the math.
As me personally i've never been at war, but i couple of years played tactical paintball. And for almost 4 years it happened only once when I was able theoretically "stab" an opponent (I just pulled his barrel), only once in 4 years. Knowing that anyway nothing really bad will not happen to me. And taking into account situation that the enemy was 1 meter (end of his barrel I would say half a meter) from the doorframe and couldnt react on my diving under his barrel. but I had very-very slim chances, if he would be at least half meter further or if I would miss grabbing his barrel, i would receive some marks undoubtly.