Huldbrand and the fisherman sprang after the maiden, but when they reached the door of the cottage and looked out into the night she was nowhere to be seen, nor could they catch the sound of her tiny feet to guide them whither she had fled.
The knight looked in astonishment at his host. Was the beautiful maiden only another of the wonderful beings who had bewildered him in the forest? Was she some lovely elf or sprite who had come but to vex them with her pranks?
But as he looked at the old man standing by his side, and saw the tears streaming from his eyes, he knew it was for no spirit of the wood that he thus grieved.
'Alas,' sighed the fisherman, 'this is not the first time that the maiden has treated us thus. It may be she will not return the livelong night, and until she returns it is not possible that we should close our eyes. For what terror may not seize upon her as she wanders hither and thither in the darkness.'
'We must follow her, father, follow her without delay!' cried the young knight.
'Nay,' answered the fisherman, 'my limbs are stiff. Though I knew whither she had fled, I could never follow with speed enough to reach her. Ever she would vanish as I drew near, for she is fleet, fleet as an arrow from the bow.'
'If we may not follow her, at least let us call and entreat her to return,' said the young knight, and without waiting for an answer he called, 'Undine! Undine!'
But the old man shook his head. 'It is useless to call,' he said, 'the little one will not heed your voice.' Yet still the knight's cry rang out into the night, 'Undine, dear Undine, I pray you return!'
No answer came back from the darkness, and at length Huldbrand returned with the fisherman to the cottage.
The old woman, who seemed little troubled by Undine's flight, had gone to bed and the fire was wellnigh out. But the fisherman, drawing the ashes together, placed wood on the top of them, and soon the fire blazed brightly.
Then in the light of the flames they sat and talked, yet they thought only of Undine. The window rattled. They raised their heads to listen. The rain fell in heavy drops, pitter, patter. They thought it was the tread of tiny feet.
'It is she, it is Undine!' they would cry, yet still the maiden did not come. Then they shook their heads sadly, but as they went on talking they listened still.