Seiji contemplated this matter.
He hadn't thought too much into it at first and had the mentality of simply trying it out. But now, upon closer consideration, was it really the best choice to "educate" Shinobu?
Yomi's joking aside, she—Shinobu Miaki—was an artificially created product that his enemy made. Leaving her alone might cause harm to others… he didn't care if she killed Akatsuki Mitarai; in fact, he would be delighted if that happened. However, if she turned into a powerful demon that posed a danger to others, that would be a bad thing.
He felt that he should act in order to prevent harm from coming to others. But if he "educated" her in order to prevent her from turning into a demon, wouldn't that end up benefitting Akatsuki?
Then, Seiji pondered if he should take advantage of her in killing Akatsuki off, but not letting her devour Akatsuki and turn into a demon. Was this possible?