There is no specific answer to this question, because the description of "the evil fish is flooding on the bridge and the evil fish is coming" is too brief, and there is no clear context and background information.

Generally speaking, "the bad fish on the bridge is flooded" may mean that some bad or immoral people on the bridge are not allowed by society or law, and "the bad fish is coming" may describe the tragic situation of these people after being exposed or hit.

However, due to the lack of sufficient information, we are not sure whether this explanation is accurate or unique. Please provide more contextual information to get a more accurate answer.