Final Answer:
The information provided does not specify the name of the policeman riding in the police car with the sergeant.
Step-by-step explanation:
The given information does not include details about the name of the policeman accompanying the sergeant in the police car. In some contexts, specific names may be crucial for understanding the full narrative or for investigative purposes. Without additional information, it is not possible to provide the name of the policeman in question.
For more details about the specific incident or individuals involved, additional context or information would be needed. Please provide further details if available.