Which powerful experts thoroughly embarrassed himself when he first appeared in the novel?
Here are 2:
Ding Chunqiu - the guy had been hyped all throughout DGSD. He was mentioned many times, and each time people pretty much feared him. But what does he do when he first shows up? Yep, get his a$$ kicked by Quan Guanqing!!!!!!!!!!!!!!
Murong Fu - I believe the first time he really shows up was in the chess game, in which he almost committed suicide out of fire deviation.