Which laws of wulin did Huang Shang violate?

[PJ]

Huang Shang, creator of 9 Yin, was accused of having violated the etiquette of wulin, by the Ming Cult. It was said that Huang Shang's army fought several military battles with Ming Cult, and having lost all of them, he challenged several top fighters of Ming Cult to a duel and killed them all. So which of the above is a violation of "wulin etiquette"?

[Candide]

So which of the above is a violation of "wulin etiquette"?

Neither.

His violation is learning what appeared to be Central Plain martial arts while being an imperial officer & leading an army against a wulin organization. Wulin folks hate those who use Central Plain MA to serve the empire (remember Liu Chengfeng in XAJH?) to oppress them.

[kyss of the sword]

it might be the rule of the elder verse the junior. the elder does not use a heavy hand and the junior defends the first three moves. he killed several fighters, at that time, he might have only been in his thirties, he might have begun his compendium of daoist knowldge when he was in his early twenties. the ming top fighter may have been older and HS's methods may have been too ruthless according to the rules. XLN did not have any knowledge of wulin rules either. when she fought HDT, she straight away used lethal moves.