Belief in the supernatural.
A main point of the Romantic era was the idea of intense emotional expression and the individual self, however it also dealt with an interest in supernatural interest and mysticism. There is a lot of influence from greek and roman mythology and the power of supernatural forces, so this makes the most sense.
Had to look for the details and here is my answer.
"Saboteur" is actually a short story that was written by Ha Jin. And based on this story, the quote that best foreshadows the method of revenge by Mr. Chiu is this one: "I shall report you to the Provincial Administration. You'll have to pay for this! You are worse than the Japanese military police." Hope this answer helps.
