I would love to take those NTSB members, put them atop a 20-foot platform, give them a two-inch-wide nylon strap (that has been slimed by the residue of skin and blood), and see how long it takes them to screw up the courage to jump. These are not firefighters. This maneuver is not practiced in training - we practice going through the window but it is sitting at floor level. The slides are supposed to work.