honestly, would you really have waited for his rotor blades to come flying at you and your aircraft or would you have taken the chance to fly away to safety without getting hit.
You said
the engine is shut down and out jumps Mr. Pilot himself, the blades still spinning at idle speed
so how in the world are his rotor blades going to come flying at you? It would take little time for them to come to a stop and seeing as they were fitting the ground handling wheels I presume would have been out of your way in short order.
I know myself that it sure enough could have done harm to his aircraft
The mind boggles, a complete and total lack of care and airmanship, one of the me, me millennial brigade we hear so much about?