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Ok, first you need to be working with horse A and horse B is the one that you aren't messing with. Tie up horse B or put him in an area where you can get right to him but he can't follow you around. Take horse A as far from horse B as you can without horse A freaking out, if horse A wants to go back to his buddy, let him, but as soon as he gets there make him work HARD, direction changes, tight circles, don't let him have a second to rest, then take him back almost to the freak out spot and let him stand and relax, catch his breath but do not restrict his movement, if he wants to go back to his buddy at any point, allow it, but make him work really hard over there and let him rest halfway across the field. So, being alone with you means he can rest, being near his friend means he gets tired and sweaty. It will take a little while, but it does work.