That guy ran out of power, and pulled the rpm down. That caused his sliding pedal turn. When he hits the ground, he is falling at about one fuselage height every 2 seconds, thus about 500 fpm. If you overpitch in an OGE hover, that is precisely what happens. For vortex ring to occur in an S-61, one must be at least 1000 fpm descent (to get the initial torque kicks, etc.)
Here is a clip of the crash, I cant find the longer one, can you?
http://www.rapp.org/wp-content/09210...king_crash.jpg
In order to get any significant VRS, you must be going about 75% of your downwash speed vertically downward, and even at that, you get 5 to 10% torque jumps.
Overpitching is the reason why most helos have a VRS accident, but the investigators and instructors get the labels mixed up.
The VRS police never got to label this one:
http://www.hughes300.com/H-3_Crash_7-5-2002.WMV