Final answer:
Without the full context of the story involving Mr. Peters and Leita, it is difficult to provide a precise answer. Nonetheless, typically, a story in which a character is transformed back into their original form resolves a conflict by restoring natural order or letting go of control, which often symbolizes acceptance and freedom.
Step-by-step explanation:
It appears there is an assumption in the question that Mr. Peters uses his second wish to turn Leita back into a swan, which seems to reference a story not fully provided here. However, if we are to understand this action within the context of a typical narrative structure, a character using a wish to reverse a transformation usually aims to resolve a conflict by restoring the original state of affairs. In many stories, this can symbolize a character's acceptance of reality, the natural order, or their relinquishment of control over another's life.
For example, in the snippets provided, there is a recurring theme of birds and their significance to the human characters, suggesting a metaphor for freedom or the natural state of being. Therefore, Mr. Peters wishing for Leita to become a swan again could be seen as an act of releasing her from the binds of an unnatural form, aligning with such storytelling themes.