There's no clear consistency to when he gets reprimanded. I agree to correct him when he gets in front of you, but I don't agree with how they did it.
I see a timid/ineffective handler being taught to wack her horse in the chin with a clip so she can "protect" herself.
It just seemed that the horse and handler were more stressed out in the end than the beginning and the horse didn't learn anything other than to jerk his head up when his handler makes a sudden movement.
What happened to having your horse at your shoulder? You have more control and your horse is generally more focussed on you.