Answer:
the phrase "the hairs on my arm stood on end" indicate that the person was very shook in surprise at something they saw/read/or heard. it is similar to "having goosebumps" on your arm.
Explanation:
That is because there is no specific character development or purpose or use of the character. His purpose and use is to be the evil that would get beaten by the main character, in this case Beowulf.
