Hard to get a good feel of what ensued (which was much more exciting than this shot) but this was the beginning of a OMG-what-is-that-I'm-going-to-run-sideways-across-the-ring-and-then-try-to-launch-you.
I think it's appalling that you are making light of these moments demonstrating such serious lack of discipline, but I suppose I expect nothing less from you. You owe it to a young horse to provide them with boundaries and a structured environment to help them learn to be good citizens down the line. Horses with a lot of "Horse-an-ality", as you call it, tend to end up in bad situations.
If you cannot give him the education he needs, get him to someone who can, for his sake.