Instinctive reactions will get you hurt....or in this case killed!
You think not....have Rotator Cuff surgery or something similar....then drop an item and reach out to catch it!
We don't know the actual circumstances in this tragedy....but we do know a bit of thinking would have prevented it from happening.....starting with removing your Hat before getting near a running helicopter for instance.
No hat....it doesn't get blown off...or pulled into the inlet...and you don't blindly grab for it when it departs your head....or chase after it as it gets blown along the ground.
Avoiding the moving Tail Rotor....some aircraft tailbooms can be walked under (if the aircraft is level)....some you can be under safely so long as you stay in front of the tail fins/horizontal Stabilzer (BO and BK , Bell products for example) and some are just down right dangerous.
It is all about Situational Awareness....and not doing anything without thinking and considering what you are doing.
Every Aircraft is different....ever been around a K-MAX and its Main Rotor system?
Sadly, this fellow had a bad moment where he reacted rather than thinking about it first.....and he made a fatal mistake.
Yes....it could happen to any of us....that is the key point to remember. It might be you one day that has the Brain Infarction.