Sounds like a interesting drill thanks for linking it..
I may try it.
Except its I believe its a must to integrate some movement.
Bad guys will be shooting at you.
Standing still is poison.
Also about the transitioning..
I know it looks good but.. I am already engaging with a carbine there is no reason to go to a secondary short of catastrophic failure that can't be fixed via Tap Rack bang.
Which I have never experienced in the past 30,000 rounds of shooting.
Much more likely I might run out of Ammo.
And we are more likely to run out of Ammo when we hang the weight/bulk of three 30 rd mags on you.. and its not 3 mags but a "back-up"
A lot of the mainstream training is IMHO sub optimal or taken without context from specific TTPs of specific organizations.
For example when your rifle goes down for a catastrophic failure (and they are not real common.. out of ammo much more likely) "transitioning" to handgun while still standing around is ONLY a viable TTP when you have tactical superiority..
Like say you have night vision and they dont (and its night) or you are a SWAT team facing some stoned teens with Glock 19s.
Standing around in the open does not pass the common sense test.
When I shoot I usually move after every pair.
Sometimes to to kneeling,prone etc.
If my primary stops for any reason I will move behind cover (where I really should be already if at all possible) then reload or fix my malfunction.
They are all better options except for a very tiny slice of operations.
Those slices do happen.. but I believe for our application they are much less likely than running dry + so doing what I need to keep my primary into the fight is what I will do rather than employ a pistol (which is pretty ineffective at all but the closest ranges anyway)