Oh goodness, that little colt is a punk I love how momma patiently rotated and waited, and waited, and waited… until WHACK!
That discipline was past the three second rule I was always taught, but I suppose a horse would know best what is most disciplinary for another horse. The colt certainly got the message.
I am of two minds on this and I think with most things horse related, the answer is usually somewhere in the middle of both extremes. One – physical language is one of the many ways horses engage in behaviors with one another. Corporal punishment is part of that language. Two – if you hit a horse, you are inviting physical warfare with a 1,200lb animal that can physically outmatch you. I think you have to pick your battles very wisely and fairly, otherwise the trust and confidence between you and your horse would diminish.
Acts of kicking and biting directly at your person are acts of warfare. “Putting the fear of god in them” for 2-3 seconds and then carrying on as if nothing happened is, quite literally, how horses communicate with one another that the behavior is undesirable.
About a month or so ago, my consummate-professional of a horse bit someone and I’ll fess up, I didn’t punish him for it. His head was being aggressively rubbed by someone and he wasn’t enjoying it and was expressing it in his expression - I told them to stop, and they didn’t listen. About two minutes later, my horse must have hit his quota and he nipped them right on the finger. I figured everyone has to learn sometime.