Sentence structure goes from short “It could be fatal” - sense of irony/sarcasm here in how serious she sounds at something that she is finding so funny. Goes on to listing extended ideas “I shake, I heave, seismic, volcanic, I’ll burst” to highlight the speed which which Offred is thinking - narrative device of her linking to images/experiences, she is flooded with thoughts and actions in her body. Describing actions which the reader can always relate to.
Her links to old society give her immense pleasure - emphasises the lack of pleasure or fun in Gilead as