The Fu Li Eyes gave him extraordinarily keen vision. Thus, Ning Fan had quickly seen through the profoundness of Revered Flame's flying sword without needing Bei Xiaoman's warning.
That fiery-red flying sword was a Peak Divine Transformation Realm Spiritual Treasure. It was augmented with two great divine abilities: teleportation and shadow cutting.
Revered Flame was not a sword cultivator, but a fire cultivator instead. The flying sword he had was just for the sole purpose of performing sneak attacks.
After flickering several times, it was now a few inches away from Ning Fan's shadow on the ground.
Once it cuts through Ning Fan's shadow, his true body would also be cut. In a way, Shadow Cut was nearly the same as the ability of killing one's nascent soul by striking their treasures.