The reason Lu Yu spoke so firmly wasn't that he believed in his own cultivation level, but that he had decided, should these Qingqiu foxes not stop at that, he would call upon the Monkey. Given that the Monkey had been unbearably idle these days, if he were asked, he would certainly excitedly grab his Jingu Bang and head straight for Qingqiu's gates.
You must understand that at this moment, the Monkey is the main character between heaven and earth, the center of the great calamity. No matter who you are, you wouldn't dare to provoke him lightly. A single misstep could plunge you into disaster, a truly formidable weapon at this stage.
