“his stomach dropped” what type of literary device is this?

i go to the store and buy some cheese,suddenly there was akward silence.   out of no where comes a ninja, and he takes an apple, and chokes the cashier, until he passes out.   the disapeared in a puff of smoke.   the cashier went to the doctor, and everything was fine again.   they all lived happily ever after without anymore ninjas.

the end

go to buy cheese= exposition

akaward silence= rising action

ninja chokes the cashier= climax

cashier goes to the doctor= falling action

they live happily ever after= resolution

taken from the novel “the adventures of huckleberry finn” by mark twain (1884), the author narrates about social issues and norms related to morality, prejudice, and slavery. twain included the excerpt above in order to discuss a moral conflict that huck is in: following the moral values he has received from the society in which he lives. moreover, there are moral issues such as gilt and blame discussed here. in the excerpt above, which is part of chapter xvi, huck faces a dilemma: jim to escape or telling miss watson about jim’s flight. huck feels confused, since by choosing one action or another someone is going to get hurt. both jim and miss watson have him in different ways; jim has protected him and has been very kind with him and miss watson has him with his education. the following sentence is a clear example of the dilemma huck faces when he narrates what his conscience tells him: “what had poor miss watson done to you that you could see her niger go off right under your eyes and never say one single word? ”.