While I don't agree that verbal reprimands don't work, I think in this situation you need a more direct approach.
I'd be hesitant as it isn't your horse but if it were mine, it would be taking a trip to the post of knowledge. If it was a training horse I had in, I would speak to the owner first. Have done this with a few outside as well, only had one owner who wasn't okay with it. Told owner to pick her up & bring her back when they fixed it, they brought her back a week later and she went to the post lol! I tie and let them fuss & work through it themselves. I have a telephone pole that is cemented in my pasture, on it is a tractor tire inner tube above head level, secured with brackets & lags so it can't work down. I tie to the tube, has some give when they fight but will not break. Doesn't take long for them to figure out if they stand still and move a step forward they relieve pressure themselves. Never had one hurt themselves or not fix the problem. I do monitor them & always have a knife in case but have never neede it.
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