I got four more hens about 20 weeks old. I had them separated for a month now from my rooster and Bantam hens. To assimilate them to my old flock I have them in a smaller cage inside my bigger pen that is about a 20 foot circle. The new hens (two white longhorns and two red) have been in the separate cage for a week now so the other Hens and Caveman Paul my huge Barred rock rooster can see them and be near them but not get to them. Today I didn't close the door to the smaller cage well enough and one of the whites got out. Caveman was pecking the heck out of the back of her neck until I stopped him and put the hen back in the smaller cage. I plan on waiting at least another week or two before I let the new hens out. My question is will he continue to do this? If so how do I stop him, He is not an aggressive Roo to the other hens he grew up with or the Bantam Roo he grew up with. Just the new hens. Thanks for any help! Here is a pick of the pen and the coop.