I think They probably did not factor into that second test the "INERTIA" of that sled that delivered the car to the wall. I would bet that the sled was 4 times as heavy as the car and all that extra inertia of the sled is what did all the damage to the roll cage.
On the other hand had not that thing been bolted to that heavy old sled, there probably would not be any footage of that second crash. That thing would have bounced around that room like a big old coil spring taking out anything that got in it's way.
Honest Dad himself
