It was a cry of mourning

The loud music ringing in his ears from Hrothgar’s mead hall above his lair.

It was a war cry

He was just in a mood

This reveals that the Anglo-Saxons valued the tradition of story-telling, particularly creation.. The use of the word “Almighty” and the description of the creation of the earth reads like a Christian narrative, which show the Anglo-Saxon’s growing beliefs in the principles or stories of Christianity.

This reveals that the Anglo-Saxons valued the tradition of telling myths about creation. It also reveals the need of Anglo-Saxons to tell "fishermen stories" to make the men feel better about themselves.

The audience would be terrified for Grendel since Cain was a mythical character that ate his brother.

The audience would have difficulty making the connection since Cain wasn't born yet.

The audience would likely be familiar with the fact that Cain is – according to the Bible – the first person to ever have committed murder. They will recognize that Cain is an “evil” person, and that they compare Grendel to him.