Why waste your first shot shooting at the legs? Doesn’t make any sense.
Better than nothing. Hence the term I used: LAST DITCH EFFORT....your goal is not to shoot legs, it is to get rounds downrange quick and in an emergency because in a firefight firepower usually wins.
We are talking about <1% of firefights where this method is used mind you. It is about as rare as training to chamber your semi-automatic with your teeth/feet because you are greivously wounded and you need to reload and charge your firearm or clear an FTE/FTF. Tactics: Know them, train them, use them.
Want to watch a badass? Google "Instructor Zero". Great CCW and tactical pistol/cqb/lde instructor.