If your mages and DD are smart, the only thing you will ever NEED for Animal Instinct is provoke. If you have good reaction time, you provoke him when he uses Animal Instinct. If you're not flashing red again, Shield Bash him. In the fairly good chance you stun him, you just prevented Eye of the Beholder. At this point, Fast/Flat blade and he's yours again. As long as your mages don't try to cut loose right away again, you have enough time to recover enmity and even Spirit's Within.