I have this going on right now. And I have never had it.
A mature rooster, that just despises my BA hen. Came on out after months of getting along just fine. Does not seem to bother any of the other hens.
I have 3 cockerels that were hatched this summer. I think I will keep one of them, and LongJohns will be invited to supper. But I need to cull a few more, and I think I am going to cull her too - she is getting older, and I don't think is laying.
Always solve for peace in the flock. Now to just get it done.