From the incident regarding the metahumans of Ezhou, it could be seen that although policemen with modern weapons could hurt metahumans, they did not have a good understanding of metahumans.
If the other two elemental metahumans were Class E, Lu Shu could understand. After all, elemental metahumans started from Class E.
But what was with this Class D strength-based metahuman? Lu Shu was more familiar with strength-based metahumans, and could safely conclude that he had just passed class E, and was on the track of a Class D. But he was only considered as a weaker class D, perhaps only when he fills up his second nebula would he reach the peak of class D.
So Lu Shu knew from the moment this criminal made his move, that Lu Shu couldn't do what he could do. His speed was faster, and it seemed like this strength-based metahuman had reached class D, but not for a very long time.