So the heli was flying DIRECTLY ABOVE PEOPLE? I thought that was a no-no? -grin- I also note that in many of these cases, it's the heli that purses the multi-rotor, not the other way around, and THEN claiming to be worried about a collision. ("Stop hitting yourself! Stop hitting yourself!") In this one he obviously did that, given the shot of it landing in the operator's driveway.
There needs to be more awareness by heli pilots, flying that low, that there may be other model craft in the air. That seems like a given in this day and age.
All that being said, I DO understand that heli pilots have THEMSELVES in the air, not just about $1,500 worth of hobby equipment. I will ALWAYS immediately yield the sky the second I SEE or HEAR a full-sized craft approach, as I think most multi-rotor pilots would. Those who don't can and should be fined/prosecuted equal to the level of their infraction. Because what is the alternative? No hobby craft in the sky because a heli MIGHT decide to fly that day? That's no way to police the airspace. /rant off