wow, welld one to the ones who stayed on! For some of them you could see the refusal coming before it happened but some it just happened out of the blue or they messed up the strides or the horse tripped. This is the reason I not very fond of jumping lol.
I've seen it before, the same person has like 2 other videos of people falling, plus a video of a a huge plane taking off near the showgrounds. There is like this huge roar, and all the car alarms go off because the ground vibrated, but the horse and rider doing their course at the time just keep going like nothing happened Its pretty awesome. I think its called "VROOM" or something like that.