[header] How to survive on a runaway horse [title] Regain your balance. [step] Whether your horse has started racing the others in the ride or has been suddenly spooked, you need balance before you can think about slowing your horse down properly. Balance in the saddle will help to assure you are not thrown off. 
[substeps] If you have lost your stirrups, do your best to get them back. Having your feet planted in the stirrups helps with both balance and control of the horse.