This chapter's epigraph comes from a famous poem by the famous poet, Henry Wadsworth Longfellow. Longfellow's poem, "Invisible Man," is about a young man who is about to be killed by his father's sword, the yin sword. The young man's name is "Tang zheng," and he is the son of the master of the sword, who has suppressed the evil qi within the sword and transformed it into another form of energy, called the "yin sword." This is the same sword that Longfellow used to kill his father. This is a symbol of the evil in the world, and Longfellow uses it as a metaphor for the evil that will befall his son when he dies.