From the system's perspective, and based on previous experiments on Red Hat, simply increasing magic power in magical girls cannot influence spiritual attributes, but adding points to spiritual attributes can in turn nourish the total amount of magic power.
However, it seems that witches differ from magical girls—while increasing their magic power, their spiritual attributes (akin to mental resistance) are also continually enhanced.
This might be due to spiritual erosion, akin to mutated magic directly linking and affecting the witch's psyche.
Thus, Shi Neian was able to enhance her spiritual attributes by training in "mutated magic."
Yet, because of this, when Ke Mingye siphoned off a small portion of this mutated magic power acquired through training, the corresponding spiritual attributes also transferred to him.
