Xiao Yue gave him a burst of dry laughter. Yes, how funny.
Wu Chao Guang introduced Xiao Yue and Yu Fen to the others as Little Duck and Little Fish. When the curious soldiers asked about the origin of the names, he made up a little story, saying that Xiao Yu and Xiao Ya were cousins.
Xiao Yu's mother craved fish when she was pregnant with Xiao Yu, so when the boy came out, she gave him the name Little Fish. Xiao Ya's mother also craved something when she was pregnant.
Guess what? Correct, she craved ducks! So when she gave birth to a boy, the boy got the name Little Duck. Everyone found the story hilarious. Everyone but Xiao Yue and Yu Fen.