Great shooting Whitworth1 !
I am not certain that in a bear attack, one has 3 seconds to get rounds off, but drilling like that will sure make a guy better than if he/she did not.
More realistic drill might be shooting one handed, while on your back, with one's off hand being ground up in a limb chopper that is resting on your chest
As respects to recoil and getting back on target, I loaded some 325gr heavy loads for a Ruger Blackhawk and took them on my first Brown Bear hunt in AK. Pretty severe recoil and I did not like how I had to re establish my grip in between shots. So, I bought some finger groove grips. New problem, 100% of the recoil now being transferred direct ly to the hands and wrists. I can shoot them OK, but not as fast as the guys in that video.
My new bear country gun is my 329PD with the lock system removed and plugged, all of the various screws - especially the cylinder thumb release screw (I have lost a cylinder release at the range before learning the need for this)- all dabbed with some loc-tite, and Hogue gripper grips from an X Frame S&W. These grips cover the backstrap of the grip and make the gun significantlly more comfortable to shoot.
I CAN get 6 heavy 44 Magnum rounds off quickly now, but it just plain HURTS. 300gr loads from a 23 ounce gun is just a nasty combo. I still consider this to be an ideal set up for me though as if my left hand is inside the fur covered limb shredder, or of said limb shredder is fast approaching, I am pretty sure my adrenaline will be high enough that I will not notice or care about the beating my right hand is taking.
In black bear country, 260gr SWC's backed by 10.0gr of Unique are, IMO, quite sufficient and not only shootable from my 23 ounce gun, but not damaging to it or my hands. Also not overly damaging on small game.
Thanks for posting the video link, it was fun watching OTHER peoples hands take the pounding for a change!