why didthe writers have Grendel being Hrothgar's son ?
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I think this made for a more understandable plot point for people, as most of them were, who had never read the play before. Hrothgar would have had made a deal with the Devil and Grendel would have been the consequence. It's the sort of bargain that we might see in Faust or Macbeth.
Was the portrayal of Grendel accurate in your opinion? Explain.