Yep! 15 mph falling is survivable. His total velocity was 52.2 mph on impact - if all that had been straight into the ground it's doubtful that even the thick l

Yep! 15 mph falling is survivable. His total velocity was 52.2 mph on impact - if all that had been straight into the ground it's doubtful that even the thick layer of cardboard boxes would have prevented injury. Without a wingsuit you're not going to get ratios that good, but every bit helps, and if you can hit a sloped surface with any accuracy your survival chances go up significantly.