[Darkest Dungeon] Boss Fight : VS Swine King

Second veteran boss is Swine King and Wilbur. Squeal I hadn't known technique of Flagellant when I had hunted Inchoate Flesh, but now I understanded it - approximatively. Flagellant is so effective hero to hunt Swine King, because he can transfer allies' mark to himself while Swine King tend to depend on Wilbur's Mark. I thought about hitting Wilbur and triggering Swine King's Enraged Destruction, but I gave up it because I don't like gamble with high-risk... Then, who's next boss? Witch or Siren?