I want to provide a friendly classroom environment where the students feel inspired to create, know that their efforts will be noticed encouraged. The rules of the art room are clearly explained and monitored: the proper and consistent care of supplies and tools, the way to clean up after themselves, how to give a good critique of other's work. How to listen to instructions.
Our group decided to handle the broken leg first, since that was a quick ambulance call. Then focus on devoting resources to the missing child. Tabling the unhappy participants, and dealing w/ them after the emergencies.
Dude it's a tough mudder. Tell the guy with a broken leg to deal with it, smack the annoying complainers around and tell them to whine to their mothers. Go find the kid.