he doesn't realize he's capturing the chaotic scene on his iphone. >> i took my phone out initially to film their equipment on the stage moving back and forth. i still had it in my hand when i was climbing back in. >> oh, my god! oh, my god! >> after climbing through the metal bars, he sees magjars and her daughter maggie. >> stay still! stay still! are you guys okay? can you crawl out? >> prater, who's a registered nurse, also comes rushing in to help, as stunned bystanders help prop up the rigging. >> i looked at her arm and it was badly injured. i was afraid that she had possibly severed an artery. and i knew she had lost a lot of blood. at that point i was calling out for a tourniquet. >> whether he hears prater or not, david wood repeats the call. >> we need a tourniquet! >> wood doesn't waste a second. he takes his shirt off and drops