I have tazed dozens of people, not with the hand held "stun guns", but the 2 darts that hook in and deliver a nice jolt when you pull the trigger. With the darts in, you can shock the poop out of most people and keep them down. They literally drop like a sack of potatoes, some urinate.
Others, though, can stand right away, even run... I've had to break the darts free on several occasions and go for a 2nd shot. One dude I tazed stood there, looked me in the eye and said "Yea, I feel it"... he was on PCP though.
It also depends a lot on how good you hit em with the darts, one fires low, the other high to get a good spread and widen the area of shock, if they hit too close / far it doesnt drop em as well. Same if the hooks only snag clothes.
Once the fish hooks are in, an MD or nurse must remove them.. although there might have been an occasion or two the darts were pulled out by accident, which looks like it hurts really bad.
The training class to be tazer authorized was 4 hours with a BS test at the end.
Edit: Usually after getting shot & shocked people beg, cry, scream to not be shocked again, are willing to comply and stand, with help, up after being cuffed. While its possible the dude in the video couldn't stand, it looked to me like he was putting on a good show for the crowd.
