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You can get a horse to not fight when you are present, and in fact for safety it is vitally necessary that they understand that this cannot happen when you are there, but short of adversive conditioning (or solving whatever is underlying their aggression, sometimes it's something like ulcers) you aren't going to get them to not go after each other if that's what they want to do

So your best bet is to let them sort it out and not interject yourself unnecessarily, but also emphasize: You Are Safe