The first time I ever got run away with, I had no clue what to do. I was on a 17 year old OTTB, that at a show decided to relive her racing days. I fell into a fence, and thankfully, I didn't break anything, another time the horse I was riding got kicked, on either side of my led, just a few inches away from it, I was lucky, the mare took off galloping (she was an OTTB too). I have foun that the best thing to do is, when you are firm in the saddle, grab the mane with one hand, and with the other, pull on one rein as hard as you can, to make them stop. Emergency dismounts can be dangerous, because if you are going very fast, and land wrong, you could break your ankle anyway. If I were you, I would have your trainer work with this horse, or sell him and get a different one, maybe try him out next time.
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