Sigmund and Sinfiotli put on the skins that the men had cast off, and when they did this they changed their shapes and became as wolves. And as wolves they ranged through the forest, now and then changing their shapes back to those of men. As wolves they fell upon King Siggeir's men and slew more and more of them.
One day Sigmund said to Sinfiotli: "Thou art still young and I would not have thee be too rash. If thou dost come upon a company of seven men, fight them. But if thou dost come on a company greater than seven, raise up thy voice as a wolf's cry and bring me to thy side."
Sinfiotli promised that he would do this.
One day, as he went through the forest in his wolf's shape, Sigmund heard the din of a struggle and he stopped to listen for Sinfiotli's call. But no call came. Then Sigmund went through the forest in the direction of the struggle. On his way he passed the bodies of eleven slain men. And he came upon Sinfiotli lying in the thicket, his wolf's shape upon him, and panting from the battle he had waged.
"Thou didst strive with eleven men. Why didst thou not call to me?" Sigmund said.
"Why should I have called to thee? I am not so feeble but I can strive with eleven men."
Sigmund was made angry with this answer. He looked on Sinfiotli where he lay, and the wicked wolf's nature that was in the skin came over him. He sprang upon him, sinking his teeth in Sinfiotli's throat.
Sinfiotli lay gasping in the throes of death. And Sigmund, knowing the deadly grip that was in those jaws of his, howled his anguish.
Then, as he licked the face of his comrade, he saw two weasels meet. They began to fight, one with the other, and the first caught the second at the throat, and bit him with his teeth and laid him out as if in death. Sigmund marked the combat and the end of it. But then the first weasel ran and found leaves of a certain herb and he put them upon his comrade's wound. And the herb cured the wound, and the weasel that was bitten rose up and was sound and swift again.
Sigmund went searching for the herb he saw the weasel carry to his comrade. And as he sought for it he saw a raven with a leaf in her beak. She dropped the leaf as he came to her, and behold! It was the same leaf as the weasel had brought to his comrade. Sigmund took it and laid it on the wound he had made in Sinfiotli's throat, and the wound healed, and Sinfiotli was sound once more. They went back to their hut in the forest. And the next day they burnt the wolfskins, and they prayed the Gods that they might never be afflicted with the wolf's evil nature again. And Sigmund and Sinfiotli never afterwards changed their shapes.