Is xue Yun really weak or pretending..... I don't understand him
Well, he is powerful, but he is poisoned. So, he cannot use his martial arts bcz if he uses his force, the poison in his body will act up. So, that is why he doesn't fight, but rather choose to run away. But as you can see in later eps, he does use his martial arts.
I know Xie Yun cannot use his martial arts bcz of the poison, but I really wish to see him using his martial arts and fight with bad guys along with Fei at least for once.