Instructions
Firmly grip both reins. You will be turning the horse's head to one side, so decide which direction is safest for the horse to turn.
Grab hold of the horse's mane (hair) close to the roots with one hand, while keeping a firm hold of the reins. The reins should be short enough that there is a firm, constant pull. You use the mane to stabilize your grip and not get pulled out of the saddle. This action will prevent you from gripping with your legs, which will cause the horse to go faster.
Pull the other rein firmly and steadily back towards your knee and up to your hip. This pull will turn the horse's head around so it is facing backwards. It is nearly impossible for horses to continue running this way. Make sure the other rein is slack enough to allow the horse to turn its head.
Expect the horse to make a circle in the direction its head is turned. Continue gripping the mane with the other hand and remain calm. The horse may keep running in a circle until it stops, but know that you and the horse are much less likely to be injured if it is contained in this way.
Wait for the horse to stop completely before getting off. Remove your feet from the stirrups and hold onto the mane or front of the saddle. Then calmly swing your leg over the horses back, dropping to the ground. Calm the horse by petting its neck and talking to it to prevent another bolt.
Remember that most of the time, you are less likely to be injured if you stay on the horse than if you attempt to jump off while it is moving. Very rarely, some horses will continue to run no matter how far their head is turned. However, if you feel you are in danger (headed towards a busy road, etc.), then take your feet out of the stirrups, release the reins and jump free of the horse. Make sure you roll away.
How to Stop a Runaway Horse
The idea of clinging to the back of a galloping horse with no hopes of stopping it can be terrifying. Most horses will stop with a simple, firm pull on the reins. But even the most calm and well-trained horses may bolt. A panicked or mistreated horse may run no matter how hard you pull. In this potentially life-threatening situation, you need more than just arm strength--you need a plan.