The Heartwood and i pray to god you dont come back here anymore

While she chewed away at his limb, he would do the same with his own hold. It wasn't much, but he would make do with what he had. Pulling her away from him didn't work, so time for plan B. Letting her drop back down the ground rather than continue to try and coax her to let go of his leg, he began to saw his way into her back. Chewing, like a python on its prey - aiming to dig into her haunch and attempt to pressure on her spine if not reach it itself. 

She may take his leg, but he would take her whole bottom half if given the opportunity to reach that vertebrae of hers. 

Unaware of both Alison's arrival and Merrick's readdition to the fray - due to them both seeming to focus on Caiaphas and all he knows is that she's at his leg still. He would continuously focus on the woman for the time being, should she refuse to move, neither would he. A leg for a back; and he was growing desperate to immobilize her as quick a possible.

It's his final hit as discussed! Just trying to crush her spine now. Unaffected by Merrick's hit on Caiaphas as well as Alison's unless Phas does something in reaction.