The Firearm Blog found a great video experiment from Tactical Response: Apply TASER for five seconds, then see how long it takes for the TASERee to draw and empty a magazine into a target.
All three subjects are able to immediately draw and fire.
The video is here. I would embed it, but James Yeager is a poopyhead and disabled that option.
Tom Givens (slightly less of a poopyhead) once said that dying is damn-near voluntary. I would propose that incapacitation of any kind is similar, in that if you truly desire to keep fighting and believe that you can do it, you’ll be able to get over whatever has been done to you and keep going.