a massive thunderstorm moves the dallas cowboy's rookie practice indoors. all seems fine until the lights start to sway. >> that's when i got nervous. i thought, one of these things is going to snap. >> seconds later, the entire facility collapses. about 70 people struggle to escape, including mack, a reporter for the ft. worth "star telegram." >> it's so fast and so chaotic, your first thought is, just get me to safety, wherever this is. >> a tv cameraman keeps rolling as people try to figure out what just happened and if anyone is injured. >> is anybody under there? >> hey, is anybody under there? >> irving fire department. >> i'm at the dallas cowboy's practice facility collapsed.

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