Your best bet is to separate him from the rest before any more serious damage occurs to the other horses. I board at a facility where the BO has had to move horses around when they didn't get along or fence off smaller sections to deal with more aggressive horses.
There was a situation with two dominant mares that cornered another mare and kicked her until her back leg was broken. It's better to act now and get the horse moved away from the others before something really bad happens.
There was a situation with two dominant mares that cornered another mare and kicked her until her back leg was broken. It's better to act now and get the horse moved away from the others before something really bad happens.