I know this won't help the present situation, but maybe will help someone in the future. Bullying usually begins with just one bully, but if left unchecked, other flock members may join in. The victim can be tormented endlessly and eventually killed. If you can intervene while there is still only one bully, you can stop the tormenting. If you want to try separation and re-integration, that might work, but in my experience, the bully eventually becomes a bully again after re-integration, unless you make some dramatic management changes (like quadrupling the amount of space they have) I recently killed a bully who pecked the head of another bird to baldness. The latter was once a fiesty, confident bird, but as the bullying progressed, I saw her gradually lose self-confidence, becoming a shadow of her former self. Other birds were just beginning to bully her. Last week, I couldn't stand it anymore, so I put an end to the #1 bully, hoping that the others were not totally entrenched in that behavior. It worked. The other flock members seem to have "forgotten" all about tormenting the victim, whose self confidence is on the rise. She's relaxed and happy and part of the flock. What I did might sound cruel, but it certainly is not humane to keep a victim confined with the bully.