The point that we are all working around is that power problems in OGE are usually NOT Vortex Ring State, and that 300 fpm descents in the hover are not by themselves dangerous.
Here is a web site that does a credible job of discussing VRS:
http://www.safetycenter.navy.mil/MED...n03/vortex.htm
Here is a diagram from it, the values are quite valid for light helicopters. Note that it is NOT POSSIBLE to even feel slight VRS at descent rates less than about 750fpm, and full blown VRS requires 1000 fpm:
