Hustle Those Feet
Once you’re back in control of the horse after doing a One Rein Stop, put the horse’s feet to work. And I mean you need to make him hustle, constantly moving his feet forwards, backwards, left and right. Trot him in serpentines, do rollbacks, lope circles, etc. What you do isn’t important; it’s just important to hustle his feet and make him constantly change directions. Those two things will force the horse to use the thinking side of his brain and focus on you.
Then, after about 10 minutes of making his feet hustle, walk him down the trail on a loose rein. Dare him to take off again. If he breaks into a gait faster than a walk, immediately shut him down with a One Rein Stop, and then put his feet to work. Make him realize that bolting just results in more work. After a few repetitions of having to hustle and sweat, he won’t want any part of taking off on you. This fix will not work if you’re not assertive and do not make the horse hustle his feet like his life depends on it. If you bend him around in a few cutesy, cutesy circles, you’ll be wasting your time and teaching your horse nothing.
This correction will also not work if you give the horse any rest. Don’t do a One Rein Stop, sit on the horse and cry for 10 minutes while you sort out your feelings, and then put his feet to work. Put him to work as soon as you feel like you’ve got him under control again. In fact, if you don’t feel like you have to, don’t even bring him all the way down to a standstill. Pull on one rein until you’ve slowed him down enough so that you don’t feel in danger, and immediately go put him to work. The less downtime you give the horse, the better.