Then Misty turned to Fin and said: "I am a brother of the seven boys who went with you to save the children of the king of France. I was too young for action at that time, but my mother sent me here now as a gift to help you and tell you what to do. When you go to the hag she 'll ask you for the sword, but you 'll not give it, you 'll only show it to her. And when she has seen the sword she 'll ask for the head. And you 'll not give the head to her either, you 'll only show it; and when she sees the head, she 'll open her mouth with joy at seeing the head of her brother; and when you see her open her mouth be sure to strike her on the breast with the head; and if you don't do that, the whole world would n't be able to kill her."
Then Fin left Misty where he met him and with "Iron back without action" he made for Tara of the Kings.
When he came in front of the old hag she asked him had he the gifts. Fin said he had. She asked for the sword but she did n't get it, Fin only showed it to her. Then she asked for the head, and when she saw the head, she opened her mouth with delight at seeing the head of her brother.
While she stood there with open mouth gazing, Fin picked out the mark and struck her on the breast with the head. She fell to the ground; they left her there dead and went into the castle.