The cowboy must separate 3 calves (one at a time) from the herd in 2:30 min. Horse and rider are a team - the horses are extremely well trained and know exactly what's expected of them.
Great series Howard. You're pictures and comments are spot on. Once the cow has been identified, the horse takes over and it's game on and the cowboy's only job is stay on. Take years of training and practice to get to that point.