How does Grendel explain his existence and how does he change.
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This is pretty existentialist stuff. Basically Grendel sees the world as pretty chaotic. The world, like the bull, is mindless and destructive. The only constant in all the chaos is that he exists. Grendel then ceases to be so scared of all the terrifying images that run through his mind. He simplifies his outlook to everything that is Grendel and everything that is not Grendel.