Even if Di Fuyi were to be released, he would not possess any spiritual power. Mo Zhao was indeed evil and ruthless. Firstly, he had stabbed Di Fuyi in his lower abdomen so that he could not use his spiritual power and now he was going to reduce Di Fuyi's spiritual power using the spiritual chain. It looked like he wanted to make him handicapped.
Mo Zhao was a cautious person, and he knew that Di Fuyi's spies must have disguised themselves among the people that he had led out from the palace earlier. Therefore, he did not allow them to continue with their prior duties since they returned and instead kept them all together in a big hall. It was like a massive prison without any windows and only a small door with a passage that could fit one person at a time. He then investigated them one by one.