The independent clause is “It rang quite loudly”.
"Because the teachers thought the seniors' prank was funny, it resulted neither in severe punishment nor letting them off scot-free," is wrong because of the "letting."
Parallelism is the use of pieces in a sentence that are similar in sound, meaning, etc. The -ing in "letting" isn't similar with the rest of the sentence.
In her poem “The Fish,” Bishop describes her emotions when she catches a big fish and observes it carefully. The poet’s imagist style is found in her detailed description of the fish that she caught:
its pattern of darker brown
was like wallpaper:
shapes like full-blown roses
stained and lost through age.
Instead of using a specific rhyme scheme to give the poem a musical quality, Bishop uses literary devices, such as alliteration, to create rhythm in her poem:
still crimped from the strain and snap
She also creates a musical rhythm within the lines by using assonance:
frayed and wavering,
a five-haired beard of wisdom
trailing from his aching jaw.
I stared and stared
I'm no genius, but my guess would be that it shows consequence because the dog was hungry. The consequence of his/her hunger led it to eat the meat that it's mother had put out.
That's my two cents.