Did GJ or HR ever use the skills from Volume 2 of JYZZ?

[goodrick]

It was believed by the beginning of ROCH, that at least Guo Jing (and maybe even Huang Rong) had mastered Jiu Yin Zhen Jing. Did they ever use any of the profound martial arts in the second volume of this book like the Jiu Yin Bai Gu Zhao and the Heart Destroying Palm or any other skills from 2nd volume and why not (if they didn't?)

[pannonian]

It's not specified which book they were from, but Guo Jing used external-internal skills from 9 yin when he was fighting against Ouyang Feng in the abandoned hut. They were trained internally so Ouyang Feng couldn't peek, but had external effects, unlike the bone and tendon healing skill or the qi cultivation. Huang Rong doesn't get as many fight scenes, and I don't think she ever used 9 yin in the text other than the soul altering spell.

[kyss of the sword]

the techniques in 9yin are dependent totally on inner power. even the few skills MCF and her husband learned are based on inner power. to master it without the right inner power technique, iron corpse and copper corpse used dangerous methods and ruined their appearance.
guo jing used the teachings in 9yin and even modified HL18Z. he utalised the 9yin techniques when fighting against OYF. OYF was confused because some of the moves were the same as the manual he received but others were different.

[goodrick]

So basically Guo Jing and Huang Rong never really used the techniques in the second volume of JYZZ

[kyss of the sword]

they did use the techniques in the manual, but for palm skills, GJ used HL18Z but merged the techniques for palm skills into HL18Z. he used the other skills when fighting with weapons, the internal energy defense skills and lightskills/avoiding attack skills were also used.

GJ revised and greatly improved the skills taught to him by the seven freaks with 9yin. his kids and disiciples may not have learned 9yin in full like GJ and HR did, but most of the skills they learned were 9yin improved. 9yin contained several vastly different techniques.
HR may have used more of the palm and fist skills as it mentioned in 9yin manual.