I tried to find some photos that showed a profile view of a rider going down hill. Not many in my collection. Guess I'm hanging on when gong down steep hills instead of taking photos.
Here is m daughter going down a hill. And I think she is in pretty good body positon.
Another steep downhill. But it is hard to see the riders psition and many are just kids hanging on.
As far as the horse going off a 10' earth bank. I ride that area a lot, and sometimes you just have to do it. It's Butch Cassidy and the Wild Bunch country and those rider want to taste the challenge of what the Outlaws had to do. But most times there is an alternate route around. But I a possee was chasing you, there was no time to search out alternate routes