The bolt can be ridden out on a straight line simply by staying square in the saddle and waiting for horsey to tire out or be lucky enough to be in a large area where you can circle or apply the pulley rein, but that abrupt change in direction at speed would get most riders off, so don't feel bad. Prevention is best. If you have any idea it might be coming, have your one rein stop ready. Problem is, as you already found out, it has to be practiced to the point where it is an automatic reflex on your part. Hope your tailbone heals quickly.