At the beginning of the story, Gregor Samsa may have transformed into an insect, yet as you progress through the series, it becomes evident that his essence remains unchanged. Transformation must result in significant changes, not solely in outward appearance but also internally. Despite his transformation, Gregor chose to continue working to provide for his family. He understood that once he could no longer support them as a human, they would have to manage independently.
I would express it as: "A massive wave seized him and propelled him effortlessly and at incredible speed completely over the boat and far beyond it."
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