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. >> irving fire department. >> i'm at the dallas cowboys practice facility. >> yes, sir? >> the indoor facility collapsed during practice. >> what has collapsed? >> their indoor practice facility. >> okay. anybody hurt?