Thanks to everyone for their feedback.
I know the BR was asserting her dominance, but she had never gone so far as to actually draw blood before, and the rooster did not intervene. I thought roosters were supposed to keep that sort of thing from getting out of hand?
It has been a week since...
I will pose my question first, since the back story is a long one:
What should I do with my suddenly turned vicious dominant hen? Our rooster has also turned nasty--although that has been a longer, slower process. I am tempted to slaughter them both, but am reluctant to do so. The rooster is...