I didn’t have the opportunity to look at the jumping video until just now. It made me think of your earlier comment about trust. A requirement for relationships of every kind, animals or human. However in this case the human trust in the animal to perform is very high. Something that hours together can only provide.
It made me remember the horses we had on our little farm. Only one of which had the personality would I trust to jump ( preferably not with me on him). The other horses, although they were fine saddle horses, I would not have thought to train them to jump. Maybe incorrectly but the trust would not be there. I don’t know if somebody that hasn’t been on a horse at a full gallop would conjure the adrenaline it produces.