Power and Sorcery

Magic, witchcraft, and the Sending Boat are central to the plot, representing both oppressive control (the witch-wife) and tools of liberation (Birdalone's use of spells and the ferry).

The witch's magical control and Birdalone's learning of the Sending Boat magic highlight the theme of sorcery.

The witch's skin-changing is a clear display of her magical power and control over her own form.

The witch-wife's power over Birdalone is evident in her questioning and threats, while Birdalone's new guile represents a subtle shift in the balance of power.

The witch uses her magical powers to threaten, pardon, and then invisibly transform Birdalone, demonstrating her absolute control over the maiden.