Sorry to sound naive, but I was talking to another mum at the menage fence yesterday, and she had sustained some injuries after being bolted with and then falling off mid-bolt. I've been bolted with twice in the dim and distant past. I started to think that I don't really know how best to handle it. Obviously, with hindsight I lost control and the horses I was on panicked; so remaining firmly in control and avoiding situations which can frighten horses are obvious avoidance tactics.
But if you do find yourself in mid-bolt, what to do? I have been taught a sort of sawing action on the reins for strong pullers. I guess if you can steer them into an enclosed field or something, that would help?