I absolutely hate this. Prayers for him an his family (realizing it was some time ago now)
Being a fairly avid heli pilot... People need to remember, skill doesn't mean anything... People make mistakes, and these machines are not toys... The amount of force those blades carry is tremendous, and they are very stiff...
I lost a plastic blade grip in flight once, it was an esky belt cp, the blade cost me over 400 dollars in the milli second it took to sail cleanly threw my garage door.
Helis are not the only dangerous things in the hobby. One of the old timers at our local club lost two fingers to a gas plane.
At my local rc speed way last year a guy broke his ankle in the parking lot when a man lost control of his losi 8 buggy.
These accidents are few and far between, at least serious ones, but regular less we should all work a little safer around these machines...
The single most scary part of piloting rc helis is how quickly things can go wrong... These are very high performance and it takes fractions of a second to loose control.... I even program a pitchless profile in my transmitter so I can check blade tracking with the machine stationary... Doesn't keep you safe from failing blade grips..
Fly safe
Best reguards
Andy