In DGSD, Duan Yu learnt the beginning part of BMSG, the foundations of the art, comprising the most important meridians. But then decided against learning the rest of BMSG. It was said that and I quote from the DGSD translation thread;Duan Yu, with just the basics of BMSG, was able to accumulate vast quantities of internal energy. Mostly via fortuitously gaining contact with his thumb to someone else' pressure point. But he also absorbed the qi contained in an opponent's strike to the pressure point on his chest.The scroll also had ways to cultivate the many other channels and meridians; all of them were for absorbing the internal energy of others.
The question is, what are the full effects of BMSG, had Duan Yu practiced BMSG in its entirety?
Does it make him virtually untouchable (except weapon strikes) and any attacks utilising inner energy rendered not only harmless but beneficial to Duan Yu?