When Grendel says Unferth's "beard and hair hung straight down like seaweed", the literary device used is SIMILE.
Simile is comparing two unrelated and dissimilar things, people, beings, places, and concepts using the words "like", "as" or "such as"
Beard and Hair was compared to seaweed using "like".
Allusion. Shakespeare references prominent characters in Roman mythology.
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Answer:
Call the national child relief helpline, 1098: Besides filing a report with the police
