When you use imagery in poetry it helps you to visualize it more or better.
Visual effect of poetry.
Answer: There's a sparknotes and shmoop summary for chapter 7 of the book Night, it describes their relationship perfectly. I suggest you go there.
Explanation: See answer above.
Carry grendel's severed head back to heorot. beowulf finds that hrunting is useless against grendel's mother. beowulf slays grendel's mother with a giant sword.