Yikes! That could have easily been fatal. I wish we could have seen how it had been hung. From what we did see of the fixture, there wasn't any sign of any professional rigging connection on the fixture that I could see. That kid was really lucky.
Also looks like some hardware store lights and an extension cord. I am guessing they threw a rope over the bar joist and an extension cord. After who knows how many times the rope frayed and whoosh down it comes. Good thing (?) it was still on because those gym lights took a while to come back on.
wierd, Looks like a quad-box mounted on the center of the 'fixture' But I onoy saw one line, the extension cord, or cable. I didn't see anything else that would have been holding it up...