Assuming that this guy is doing more than raising and lowering a bedsheet
backdrop, he's crazy! So to start with what is he rigging from this (not that it really matters... but still I'd like to know)?
2nd, he's nuts! I have seen unrated 'rigging' (non-theatre) fail spectacularly. If I can find it I'll post a picture of what happened to a trebuchet we built last year (using rather large amounts of weight) and you can show that to him. Needless to say on various engineering projects I have proven that 'it looks strong enough' is not always (or even usually) the case (we were following proper
safety procedures for this kind of testing... including NOT rigging it over peoples heads!).
Ropes WILL break... especially if stressed by improper rigging methods like no pulleys. Unrated carbiners are plenty strong enough for your keys, but can fail under as little as a 20lb
dynamic load. Steel pipe can
bend, break, deform, ect. All of these are putting the crew and actors LIVES IN DANGER!
Fly systems are dangerous enough when properly built. I have seen a near miss where someone could have been killed-- with a trained rigger 20 feet away (how the hay this happened is irrelevant). They are DEATH TRAPS when not built properly. Email someone from JR
Clancy and explain the setup (in more detail) and I'm sure they will
cover their rear with a nice long this-is-ridiculously-dangerous email that you can take to admin.
If admin doesn't work, go to parents, the school board, even the school's insurance company! Parents have a lot of influence when it comes to
safety matters. Also
send a registered letter to the the risk management officer or an administrator which requires a signature. This should make them nervous because it would make them easy lawsuit fodder if anything happened.
Phase 2 (if the previous doesn't work)
call building inspectors,
fire marshal (I doubt his 'rigging' is flame retardant), board of education, ect.
Failing all of this (and I really mean try this first) you could
call news media. They LOVE people putting kids in danger.