 According to Li Quan, "the classics say that the crossbow is fury.It is said that its noise is so powerful that it sounds like fury, and that's why they named it this way," and by using the volley fire method there is no end to the sound and fury, and the enemy is unable to approach.Here he is referring to the word for "crossbow" "nu" which is also a homophone for the word for fury, "nu".