gearshift48
The staff is an extention of the Inquisitor, thusly, whence its tip glows the darkness that inhabits the triangle on his chest, it is not the staff's darkness, but his chest's darkness. Passing the darkness does not steal something's energy, it is like it was scraping reality away, thus, the spheres, to the better knowledge of everyone but the Inquisitor and the ones connected to him, simply dissapear. But in truth, they are being transmitted to the fourth layer of the Inquisitor, never to be seen again. The same happens to all energy that the Inquisitor "Absorbs" as well.
Despite the dark spheres, they are too few to bother the Inquisitor's reflexes, as his power is activated, none of them can actively get close to him without simply fading away to his absorbtion, focing Genu to change his strategy.