I saw the video (finally). My first impression is that it reminds me of the Mark Todd video chasing the horse into the water with the branch–it’s almost bizarre seeing one of the most decorated riders in the sport behaving like a bad horse trainer at the worst backyard barn teaching an up-and-down lesson kid how to canter on a lame lesson horse. Even with the giggling in the background. (Only at least with the MT video it was just one time, and the horse could have gotten away.)
I don’t know why people are discussing the student. Personally, I am sympathetic to a child being trained by an Olympian and not knowing what to do or even if she is right to object, and ditto the rider’s family. But even if you don’t feel that way, Charlotte is responsible for her own actions, and she is the subject of the thread and the instigator.