I love kids, have my own grandkids. They would no more think of going into a restaurant and running around as flying to the moon. Yet, how many times do you go into a restaruant and see kids running around, banging their forks on the plates, screaming, etc? I would have taken them outside by their ear, trust me. Yet, today it would be considered abuse.
I train dogs. My dogs MIND and MIND now. If I was working with a dog and had to dicipline it, and a teenager came over and started to "help me" I would tell them to take a hike. If I tell them to sit and they ignore me because of something else going on, I will PUT them in a sit and use my voice to do it. I would not kick a dog, because they are not a horse, but would use a jerk on the collar or whatever to make it happen. Yet, other folks will say" isn't that being a little hard on them"..... See, its how you percive it.
She was not beating her horse, she was not torturing her horse, she was diciplining it for moving around. Maybe in this case, she should have taken a breath, but how do you know the horse doesn't strike out or kick or some other thing while being groomed and was trying to avoid a major meltdown?
If this had been a BIG trainer, would you have felt you needed to butt in?
This is not your business, and I am sure the BO will say the same thing. Mind your own business, because you could be bringing alot more to your plate than just ignorning it.