I had my horses organized in two herds: the main group with 2 mares, one gelding and 4 young ones and the second one with only 2 young stallions. Unfortunately my herd is growing too big and I have to sell some horses. The first one to leave was one of the stallions, so the other one is left alone and I had no other chance than introducing him to the other herd. The result was a fierce display of horse behavior. For some people this video may appear too rude, but this is the nature of horses.