This fishing technique has been referred to as using a "DuPont spinner."
I thought, if it had been grenade fishing, that the video was funny as hell. Learning that it was an on the job accident resulting in a fatality takes all the fun out of it. I wonder what happened, and suspect the dead guy wasn't adequately familiar with grenades.
And of course I appreciate the uplifting advice not to laugh at death. Never thought of that before . . .