ORIGINAL: Sport_Pilot
The first low pass was illegal and the air boss should have told the pilot to leave the area when he did this.
Please site a source for this being "illegal" - from the AIM or an FAR, preferably.
Also, the "air boss" had no authority to direct the FS pilot, nor did he have a reasonable expectation that he would be able to contact him.
(No NOTAM for the R/C demo flights, and an uncontrolled field with no radio requirement.)