Why is the simile from lines 213—216 of The Odyssey, Part 1 effective?

...and whisked away his great door slab to let his sheep go through but he, behind, reset the

stone as one would cap a quiver. (from The Odyssey, Part I, lines 213—216)

1.It emphasizes that a stone prevents any escape from Polyphemus's cave.

2.It reveals how enormous and strong Polyphemus is.

3.It tells that Polyphemus is not only a shepherd, but also an archer.

4.It shows that Odysseus's men quivered with fear.