This sequence of photos shows the extreme consequences of not checking your girth!
When one of these photos first appeared on Facebook, there were cries that it had been photoshopped.
Having been in nearly the same position myself (but very fortunately I managed to get my huge naughtily-bucking horse to halt when the saddle and I were perched on his neck, and then slid off very quickly and thankfully) I know that it is possible!
I also know for the fact that a certain 4* rider ended up sitting on the floor looking up at his horse on the gallops on the final workout before a big 4*, thanks to a loose girth and a rabbit that startled the horse… so, it really can happen to anyone!
Check it… and then check it again, especially if your horse puffs out like one of these!