UMM, EXCUSE ME, BEOWULF IS SWIMMING TO THE BOTTOM OF THE LAKE!!!! AND THE TEXT SAYS IT TOOK HIM MOST OF THE DAY!!!!!!! So, what happened to all the gore, and the monsters, and the trivial fact that humans, cough, cough, SNEEZE, can't breathe under water?!??
Unferth's blade can't pierce Grendel's mother's skin! This seems a bit too far-fetched, but maybe Unferth was trying to get revenge on Beowulf!
Instead, Beowulf uses a huge blade that he finds in the lair. This blade is able to kill Grendel's mother. Beowulf also uses it to cut off Grendel's head, and the blade then melts. Beowulf brings back Grendel's head to Heorot, where it is described as "a horror for both queen and company to behold" (line 1649). Mentioning the queen so specifically like this is interesting because it helps cement the Anglo-Saxon image of women being, well, dainty little creatures, I guess :D
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