When one wanted to reach the third stage of the mortal realm, one had to properly complete the first two steps. Only by infusing his body with enough of energy and adding a layer of it around his body, would one create a resonance within that would finally allow one to create and drive his internal energy. Even though it was just a single step on the road, one would be more correct by calling it a leap!
Not only there was a need for a proper, even if only a small, cultivation drive, one had to use it to push the energy gathered in its dantian against the pressure coming from the energy already gathered in and around him, to forcefully infuse his dantians with enough energy to create paths. Only then would one be able to use this drive to change its natural energy state from a stable one in dantian to a mobile one around his meridians!
But to do so, there was a need for an enormous amount of energy!