As a young man who experienced a broken fibula while playing football, you'll have a very hard time convincing me that Booth was able to mount that horse.
I remember my friends helping me to my feet and standing on the broken leg, feeling little pain. But I distinctly remember trying to take a first step on my own (I was a tough guy back then) and collapsing. I know all injuries are different but there was no way I was able to walk, let alone run. The thought of lifting my broken foot as high as a stirrup, on a skittish horse may be possible in someone's world but I know it was not possible in mine.
I'd love to see Vegas odds-makers handicap that scenario.