The speed of an Immortal True Person's flight was simply beyond anything Void Step could imagine.
In Su Che's understanding, no matter what path a flight technique took, its outward manifestation required a prerequisite.
That was to wield one's mana and generate a force that changed one's original state of motion.
Under that premise, one broke through layer upon layer of resistance and continued forward.
This was the most basic prerequisite. Then, if one wished to alter the speed of flight, one could further work on changing one's own state or adjusting the method of flight.
For instance, one could refine away one's physical body and turn into a ghostly body, naturally unfettered and free, with one's speed soaring. Or one could alter one's flight radiance to better suit different environments; the Void and the Ninefold Heavenly Firmament were not the same...
But for an Immortal True Person, "flight" as a concept had already undergone evolution.
They could already alter the surface manifestations of the Nine Methods of Heaven and Man, thereby achieving a leap in concept.
At this moment, Devil Lord Sackcloth truly broke through the clouds and entered. The principles he displayed were entirely different from when Yulizi had brought Su Che through the Ninefold Heavenly Firmament and back to the Yellow Heaven Sect's mountain gate.
At that time, Yulizi had been a master who imparted the Way and bestowed learning. He had led Su Che upward layer by layer precisely so that his disciple could sense the changes in the Ninefold Heavenly Firmament and prepare for Void Step in the future.
But Devil Lord Sackcloth had no such intention. He chose to enter from the Southern Pole of the earth, using his boundless mana to directly slice open the thin Ninefold Heavenly Firmament and pierce straight through