- “After First Ancestor passed away and returned to Heaven, Second Ancestor stumped upon a volume of Buddhist scripture by First Ancestor’s cattail hassock, and that was the Tendon Altering Sutra. This volume had very abstruse argumentation and principles, and even after Second Ancestor studied it assiduously, he still could not understand it.
I found the above passage in SPWanderer, chapter 18, Lanny Lin's translation.
From that, we can infer that Damo did NOT ever use Tendon Altering Sutra to fight opponents.
But in DGSD, Yi Jin Jing was said to be making up the great fame of Shaolin and togerther with 6MSJ were 2 strongest kung fu skills. So it seemed that Yi Jin Jing in SPWanderer was pretty the same as the Yi Jin Jing described in DSGS.
If that's the case, Yi Jin Jing was not so powerful as we expected.