"I don't think I really understand. Please explain it to me again," Han Sen said, trying to keep his shock from showing on his face.
Truthfully, Han Sen understood the geno art perfectly. The geno art was quite familiar to him, and that familiarity shook him to his core. The geno art had an obvious connection to the Dongxuan Sutra. Both arts could benefit each other quite well, and using Mister White's technique could aid in the development of the Dongxuan Sutra.
Han Sen could use the Dongxuan Sutra to absorb power from the world around him. Doing so allowed him to conserve his own energy, stretching his strength out over a longer period of time.
But the Dongxuan Sutra had yet to reach Duke, so the effect wasn't particularly good. It only saved Han Sen a small amount of power.