Shi Feiyang summoned the Nine Demons back in haste primarily to prevent Chi You from devouring and integrating with the Primordial Spirit of the Taiyin Hunyuan Ancestor.
If Chi You was to resurrect and return to the world, the harm to the Human World would far exceed everything else, making the Emei Sect seem insignificant by comparison.
From the moment Shi Feiyang refined the Nine Demons and Nine Swords, his main enemy was no longer the Emei Sect, but Chi You! If Chi You truly caused chaos in the Human World, he would even have to join forces with the Emei Sect to deal with this Emperor Chi You.
The game of power amongst the three forces, with the mysteries of friends and foes, all changes in the blink of an eye.
Now, it was certainly unrealistic to destroy the Demon Sword in the hands of the Taiyin Hunyuan Ancestor, but it was imperative to prevent any further integration with his Primordial Spirit!
