They didn't do the best camera work, but if you watch closely you can see that all of them (except one) were visibly destroyed. Only the first set flew apart, but it was clear that nearly all of them were going to be non-functional afterwards. Meanwhile it was the same set of rockets over and over and over, and they still work.
We don't shoot movies for a living. Hard to shoot this stuff at such a high frame rate which is the only way you can actually see anything at all. We do have pics of the end result from each test. Basically it only took one hit from that hammer to render any product useless and non-functional. That set of ROCKETS we used was the same set in every test and still worked when we were done. I'm not really sure how to say how that made us feel as a company, we could not believe it ourselves but it happened.