I believe in the "common sense" category, and with adherance to the AMA safety code, if and when a full scale airplane entered the pattern, or the immediate area, he should have landed. He should also have been utilizing a dedicated spotter, at least someone who was not also trying to communicate on a radio sevral yards away from modeler. Sometimes all it takes is a little common sense to keep yourself out of trouble and avoid an accident. There is plenty of blame to go around, but if you are flying at an event like this, refuse to fly your routine if there will be full size planes in the pattern or immediate area. I have been in a similar situation and learned my lesson.