For those downvoting me for humour (no one one hurt), the explanation was, due to the rush it had no tie downs or top weights like a normal SpaceX engine test.

For those downvoting me for humour (no one one hurt), the explanation was, due to the rush it had no tie downs or top weights like a normal SpaceX engine test. The only thing holding it down was scaffolding. If you look at the photos of the site, you can see it's just a weight bearing scaffold and not a engine load bearing structural brace. This is very hard to believe.