I was finishing act 2 last battle with the Arishok and .. is bugged, I kill him but he just get up and start fighting, he won't hit my character or anyhting, if I click on him he start talking as If I let him leave with Isabela. My point is I can't kill him.
After the battle
If I talk to him:
Oh and the quest to go back to the deeproad is gone.. again.