"Unforeseen accident" sends two Shrine Circus performers to Saginaw hospitals | MLive.com
(This one has a video)
The rider seems to have hit a guy wire. He fell 25' and has a broken femur, wrist, elbow and shoulder.
Apparently someone was supposed to have moved the wire out of the way, but did not? Perhaps more details will emerge.
Also frustrating is the fact that someone decided to kill all the lights right after the accident. I'd say thats the last thing I'd want in an emergency - a total blackout.