Bring 10 antidote with you and make sure you dodge his 1 hit KO grab. Try to only swing twice before pulling back.
For me,hanging back on his third form was a death sentence. Once he gets the advantage, having you constantly heal and antidote you will be dead soon enough and lowered on provisions. Try to parry his attack and heal with blood by goin in hard. Avoid that grab too.
wow that is still a very hard thing to do.
Wanna team up.?
I'm sorry, i'm not a cheater xD