Answer :
In these lines, Beowulf is basically standing in front of a group of royals, namely King Hrothgar, introducing himself as a great man, capable of the impossible. He uses his uncanny ability to manipulate words, which in turn impresses his audience even more so than before.
The lines contributed to Beowulf being characterized to be a hero as he was courageous and skillful.
A hero is considered to be someone who is able to combat adversity by using his courage or strength.
In this case, Beowulf is courageous and without fear because even though he was standing in front of the royals, he didn't fear them as he told them that he was a great man and he impressed the audience skillfully with his use of words as well.
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