Xigger was shocked too when he noticed the giant white beastly Warrog coming towards them. For a minute there he thought he was the one coming. Ragnarok's beast form reminded him of his own beast form. He used to have white fur too. His conversion to vampirism changed that for him.
But he didn't dwell on what he lost for too long. He is in a critical situation in which the addition of an extra combatant will cause a drastic impact.
He would like to believe that Ragnarok is coming to help him but he knows that it is highly unlikely. What are the chances that Ragnarok will know that he is the father and still have enough familial love for him despite his current look and assist him in his fight against Sauron?
So he shouted to Ragnarok, "I am your father. Don't help Sauron. I am your father."
