Once upon a time I did stagehand work like this. If you have riggers or personal working over head, you need clear lines of communication open. Someone should have been calling the drop of set prieces, and the ground crew should have been responsible for catching the lowered sections and keeping other crew out of the way. Also, the ground cables should have been pulled first, to protect them from damage as the set comes out.
Nothing about this sounds like it was done correctly! The lead carpender and scenic lead should have been all over this! You have heavy metal parts coming out of the air and no one was even calling it!!?? Probably didn't even have radios. This was 100% preventable.
I just recently got back into minecraft. Man it's addicting. Like I'll just chop down one more tree before bed annnddd now it's two hours later.