Found this image over at the Reluctant Paladin.
This takes training to a whole new level. One of the first things I noticed was the loose slings. And to stand like that, trusting the horse, puts you in a position to shoot, drop back down into the saddle and ride. Having a horse that would stand completely still while you fired an 8mm Mauser over it’s head is no small part of it, either.
Not every difficult and dangerous thing is suitable for training, but only that which is conducive to success in achieving the object of our effort.