Disclaimer- this is not about my horse because, if it was, I would have gotten rid of him a looong time ago.
Assuming pain isn’t an issue, how do you deal with a horse that will randomly stop and spin? Think cantering down a line, not spooking at anything, not trying to stop at the jump, horse seems quiet, and then just slams on the brakes and dumps you? I recently rode an amateur horse with this trick and it definitely worried me. It didn’t try it with me but apparently “just does it” once in a blue moon. Otherwise seems to be a lovely animal… Does it come down to just being confident and keeping the attention? I think this is a horse that definitely takes advantage of a less confident, less aware rider and will “get your number” so to speak.
I am a pretty confident rider and have been riding and showing for almost my whole life. But, I’m also not a a professional and I’m 25 now so have definitely lost some of my fearlessness.