If your asil are really asil and they start fighting, they won't quit until someone is dead, or at least eyes swelled shut. Any breed of chicken will have pecking order battles from an early age they usually end with "ok your badder than me. I'll stay over here" . The difference is that asil don't quit. The hen will keep them in line and recognize when things are getting too serious. They will have another few skirmishes when you take the hen out. Whenever you decide to separate, they need to be separated from then on. When they fully mature, they will go to any rooster they hear crowing or see a red comb on, and try to kill that rooster, or die trying fence or no fence. You need sight barriers around your pens unless they are away from each other and nothing runs loose. Pen fights are more damaging than any other fight you could have.