I understand the worry but sounds to me like Prince is doing his job and doing it well. The fact that he only warns and doesn't do the damage he is capable of doing is proof he isn't aggressive and shows he has good restraint and control of his emotions. I'm sorry for your sister having to experience that and I am glad she is ok but at the same time I'm thinking this has been a good opportunity for you to see he doesn't attack without good reason. Imo you have yourself a very good keeper for your girls in him and the more you learn him, the more you can anticipate his moves. Can't help feeling very proud of him actually.
These are my thoughts. I can not and will not hold it against him for doing what he is supposed to do. He really is just great with the girls. He doesn't over mate, he doesn't pull feathers, he calls them when he finds something. They really seem to like him--all of the girls. He keeps peace amongst them for the most part. Precious kept escaping today and he was completely fine with me grabbing her and bringing her back but he watches very carefully. He was fine with people walking through the gate and going in the run too. I can completely tell what he is thinking. Not to mention I really like him and love observing him.
Thank you!!