The best tactic Han Fei could think of was having two spirit gatherers standing face to face, transporting spiritual energy to one another.
In this way, both parties could use the spiritual energy between heaven and earth to keep their bodies covered with spiritual energy.
But even with this method, it still wouldn't work. Although theoretically speaking, a spirit gatherer was just a spiritual energy bridging device, using his own body as a conductor to control the flow of spiritual energy. But this didn't necessarily mean that the spiritual energy that passed through his body would become his own.
On the contrary, when a spirit gatherer kept gathering spiritual energy, in fact, he was constantly consuming the spiritual energy in his body.