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This is a function similar to 'translation'.
The flying swords 'feather-transformed' by Xue Jing, though extensions of his body that he can control freely, are not made of flesh and muscles, and without the various muscular and organic systems of a human body, naturally, they cannot execute martial arts techniques that require channeling energy through muscles and organs.
The effect of the Mahayana Flying Sword is to 'translate' the 'Chinese' of human body channeling energy into the 'English' that the flying swords can understand and use; hence, once the energy is remotely transferred to the flying sword, it won't be confused, but rather capable of manipulating this power to deliver deadly attacks.
This is an extremely terrifying matter as one should know, a human body is singular, and even if Xue Jing can utilize Qi-powered avatars, he can only create at most two or three.
