The only way to catch an upset old male Wind Kwak is to dress up as an upset female Wind Kwak. Then, the male will try to understand why the female is upset and will try every possible means to satisfy her. Once the male is satisfied with his performance, you should take advantage of his beatitude to fleece him. This is what one can read in part twelve of book three on Wind Kwak hunting. Besides, it is clearly specified that this belt is an essential element to pass yourself off as a female Wind Kwak. You know what you have to do now.