Using 9 Yin To Cure XLN

[blurry]

Since she had learned the 9 Yin which had healing formulae as well how come she didn't self heal using 9 Yin?

[pannonian]

She'd only learned as much as was necessary to unblock her acupoints to escape from Li Mochou.

However, this raises another question: how did Yang Guo recognise Zhou Botong's Demon-subduing Fist? I can just about swallow the internal energy and hypnotism bits being on the wall so that Wang Chongyang can gloat over Lin Chaoying. But surely WCY doesn't need to include a 9yin fist technique to beat the Ancient Tomb martial arts.