Well, it's really actually my fault that it happened in the first place. I got cocky and Cinny decided to teach me a lesson.
I was working on lead changes today. Canter 15M circle figure 8's and asking him for a trot and then a canter on the next lead in the middle of the figure 8. He was balanced and doing them perfectly. 1, then 2, then 3...4...5... one last one to make it even, Cinny. But on that 6th one, we went to a trot and then as soon as I asked for that canter on the opposite lead he jumped into the air, with all 4 off the ground and gave a big buck. I was able to correct him immediately with my voice (he is very sensitive to being yelled at so he only gets a loud disapproval when something is completely inappropriate). I halted him, gave him a smack and he looked very dejected. My friend that was riding in the arena and saw the whole thing said she was surprised that I actually stayed on.
I have to admit, I'm pretty surprised too, he didn't even knock me off balance. A year ago I came off of him for far less.... a jump sideways and I had a cracked tailbone, a little crow hop and I was flopping around like a rag doll. I don't feel invincible, but I think I have a lot more confidence in my riding and a lot less fear that he will buck if I piss him off.
Oh, and of course, after a 5 second deep breath, I did ask him to do it again. He was perfect the rest of our ride, which he usually is when he's been naughty enough for a verbal reprimand. He even gave me a nice cool down on trail and waited patiently in the cross ties for dinner for once.