Buck encourages the riders to do their horse a favor and ride outside an arena. He explains that a horse's training is not complete until the rider and horse are just as comforable out in the open as they are in the confines of an arena.
Buck shares his thoughts about how young horses are nothing to fear, but there needs to be a level of respect between the human and the horse. If a young horse instills fear in the human, then that person needs to stick with older and gentler horses.
Buck talks about how when a horse moves, train yourself mentally to go with them. Don’t impede your horse’s willingness to go.