The word vale, adds a scholarly feel to the poem, and allows the poem to flow better overall. It is also a huge difference in the rhythm, as it has only one syllable rather than two.
The word margin was used to add a new taste of vocabulary. Margin's other meaning is "an amount by which a thing is won or falls short" so in using this word, one has the feeling that it is almost but not quite the analogy used. So it's an implication to the poem's analogy itself, giving a sort of fourth wall experience.
The man walked across the ground
waiting for the very found sound
he waits and triumphs when it’s done
for he had taken a flower gun
the flower screams in pain
and petals fall like rain
Since the line in the poem is not mention, and even the poem itself, here's a quick answer about the usage of metaphor and simile.
<span> In general sense, metaphor has a stronger assertion compared to simile . A metaphor implies that A "is" B ; a simile only says that A "is LIKE" B.</span>
