How does Bisclavaret react to his ex-wife and her new husband?

All is well until the king holds court and summons all of his vassals, one of whom is the knight who had married Bisclavret's wife. When the wolf sees the man, he launches an attack upon him, attempting to tear him apart. Bisclavret retreats when threatened by the king, but continues to attempt attacks until the festival has ended, which prompts much suspicion amongst the king's men that the knight must have harmed the usually docile wolf in some way to inspire such hatred.