Watching a horror movie in the bedroom. all were laying in the same bed when a split second before the floor gave way, she heard what she thought was thunder. >> i screamed "run" and we made it a couple of steps out of the bedroom, and the floor started to cave. >> reporter: the condo was on the 9th floor, and devin fell with the buildings five stories and her mother on debris slightly above. he leg was crushed and her femur was snapped, but she yelled for help. >> is anybody hurt down there? >> and the rescuers reached devin and her mother. her older sister rushed home who had been out to fin...