3D and Heli flying only 9 meters away? That's 30 feet. Are you allowed more space than that or are you only supposed to fly at 9 meters and that's it? It seems awful close to me especially when the pilots are not known.
Just this past weekend at our club's end of summer party, we had an IMAC guy flying 3D at the far side of the runway. That's was 100 feet away and way too close. Luckily no accidents happened
I think he was try to state that the closest a pilot is allowed to bring the aircraft by rules is a minimum of 9 meters between pilot and flyable airspace.