Allen French, The Story of Rolf and the Viking's Bow
“ There he saw the crone Thurid standing, near the house; but when he ran out to speak with her, she had moved toward the cliffs. Whether she saw or heard him he could not say, but suddenly she began to go with long strides. A little mist hung above the crags; into that mist she went, seeming to walk upon the air; and while he stood astonished the mist wreathed around her, and she was lost from sight. He said to himself that was the end of the old woman; but in an hour, looking toward the upland, he saw her walking to the hut of Asdis, and that matter he could not explain. ”
