Lines 400-424 what details and techniques does the poet use to convey the brutality of Grendel's mother attack? whats is the significance of her actions? what do they foreshadowing about the future events?

The poet describes the hurt of Grendel's mother after Grendel's death. He does this to show how vengeful Grendel's mother is. The significance of her action is that she wants to avenge his death. They foreshedow that Grendal's mother and Beowulf will fight later in the story.