The word that best describe the mood of the poem is 'VIGILANT'. The poem talks about the need to be watchful and be ready to run for one's dear life at the slightest sense of threat. The poem use simile and sensory imagery to pass across his information of the need to be vigilant.
I believe that the answer to the question provided above is that by having greater understanding of whats above can help the protecting whats below. Hope my answer would be a great help for you. If you have more questions feel free to ask here at Brainly.