Originally Posted by pocket
I know how to fix the problem, that's the easy part. I just need to get him safely from point a to point b without someone getting hurt. I know that sounds kind of confusing...
Not confusing to me. No offense, but if you knew how to fix the problem, you would have done so the other day. Turning the horse loose to get away from you in a large arena is not
the way to fix it, that will just solidify the idea in his mind "Okay, if I act like <this>, I get to run around loose and do as I please" and he'll get worse.
Like others said, since he acted that way once before and didn't get punished for it, he won and you lost. Next time will be exponentially worse.
For your own safety and for the sake of the horse, please get some professional help.