The actions you have noted for Grendel and Beowulf, and how their actions in battle reflect the qualities of heroes and monsters is written below
There are a known to have qualities that set them apart as heroes from monsters, as well as their morals and intentions.
In regards to classical literature the heroes and monsters are known to have different characteristics within the issue of good and evil.
The Heroes are said to be people that has good-hearted, while monsters are seen as people who are solely evil.
Showing good involves standing and guarding the people from harm, making or doing evil means bringing about havoc and infliction to others.
Hence, Beowulf, is known to be a heroes because he was brave, strong, powerful, attractive, confident and Grendel is seen as Monsters because he was unusual, scary, dark.
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