He was pulling back with full force...jerking on both sides. You keep your opinion, and I'll have mine...
Opinions are one thing, but facts are another. He was NOT pulling back with full force. With a pulley rein, you use full force. What I did in post 61:
Was pretty close to full force - as close to full force as I plan on ever coming. And when he stopped running (we had already done about 10 laps), I released. Then he ran again, and I pulled again. And we repeated until he decided to pay attention.
I sure look horrible. But in context of what had happened (read post 61 for details), it made sense and it worked. My daughter-in-law is riding him right now...and he is listening to the bit. And the reason he is listening is because it is better to listen than to refuse. That is what I mean when I say that sometimes you have to go where you don't want to go, so that the horse won't want to go there either.
And in terms of pain, I suspect the horse in the video is being hurt less than he would if hit with a crop. The force used was well below "full force".
My little mustang, being an ex-lesson horse, has a tough mouth. We are working on softening him. I poured an entire jar of butterfly kisses on his mouth, but it didn't work - so we're back to giving the horse choices and waiting for him to make the better one.
The problem with a snapshot or a short video is context. In a corral, Cowboy comes to me for pets, as do all the horses. I wouldn't be at all surprised if the horse in the video LIKES his rider. But without seeing how his horse behaves outside of that clip, we cannot know.