Last spring I had a leghorn hen with nine chicks. A mink got in the cage and killed all the chicks. She must have put up a big fight. She lost part of her beak and a toe. I nursed her back to health, reintroduced her to the flock. Everyone but the roo is fine with her. Since this time he does not mate, but jumps on her and pecks her comb. When she was molting he left her alone. Now she is laying again and he has begun to attack her. I caught him in the act one day and switched him. Several days ago her comb had dried blood around it. I put her in the pen with the young roo and pullets. She wanted to go back to her friends so I put her back in that pen. They free range half the day. Last evening when I went to put them in her comb was ripped almost off and she had blood all over her head. I was ready to get the shotgun, but really need two roos. What is going on? What should I do?