The NFHS book does not address this situation, but I have been advised to handle it much like the NCAA has established. Issue a warning to the HC of the offending team, give him a few seconds to tell his guys that they better get going, and if they don't the HC and 1 offending player are ejected, if that doesn't get the point across, you eject the next player in line. I've had the start of it happen a couple of times, and my partner and I will step toward each team and tell them "Let's go" and it normally gets the point across. I've tried to find the video of Paronto talking about it at the Phoenix Regional meeting that went on facebook right afterward, but I can't find it. It is a disgrace and absolutely disrespectful, so I understand the blood boiling part, but it is a serious issue that should be addressed as soon as it starts.