Final answer:
The passage does not directly answer the question about Agatha swallowing a fairy; it instead details stories of witchcraft and magic, which might metaphorically relate to unintended harm caused by supernatural beings or practices.
Step-by-step explanation:
The question 'Why did Agatha almost kill a fairy by swallowing it?' does not directly relate to any of the provided texts, as there is no mention of a character named Agatha swallowing a fairy. Instead, the provided passages seem to discuss various instances of supernatural occurrences, enchantments, and myths within given narratives.
These stories involve characters engaging in magical practices, such as spells and transformations, which may lead to unintended consequences or harm to other beings, fascinatingly weaving together tales of witchcraft, vengeance, and mysterious powers.
One of the passages tells a tale of Meroe, a witch with strong supernatural abilities who can change the fate of individuals and manipulate the physical world. Such power over the natural could relate to how a fairy might come to harm if entangled with someone like Meroe.
The broader context suggests a deep immersion in mythical storytelling reflecting the broader theme of human interaction with the supernatural in literary works.