All we can add is that having run a jumping castle business (as a weekend cash money spinner), this school has maybe just hired the jumping castle and balls to run themselves, or else the owner is very inexperienced.
I've been accused as a panic merchant grannie many a time on here but I can tell you, it's bc sometimes you have to see danger with most things around you and how it can all go wrong.
It was a constant fear operating castles. We used to tie ours to our one tonner on one side and have huge heavy duty star pickets driven in with a sledgehammer on all remaining sides. You need to worry about the blower as well bc if it stops, or is pulled out of the power source, the castle deflates with a pile of kids panicking inside. Kids are a worry too with broken arms, wrists, running together in a line to collapse the side walls, throwing themselves out the front steps and pushing each other....Ugh it makes me so relieved we sold that business 30 years ago....can only imagine what its like to operate one now.
These days people just cut costs, and many cowboy operators, and just supply them and leave partygoers to it but it's too dangerous these days to allow that IMHO without careful supervision.
So terribly sad that this has happened. RIP angels.