Ya miss something, SparkNotes. First you say that the Green Knight dismounts his horse to be decapitated, then you say he didn't fall off of his horse. You should have said "he didn't fall onto the ground as expected."
If you like the story, chances are you'll like our film adaptation. We're big fans of the story and have just finished our movie. It's only a short film (non-profit) but we sure put a lot of work into it!
Film trailer here:
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The Sir Gawain / the Film team