A guy on a bicycle shot a guy in a car. I detect no agenda from this news story.

A young gangbanger might be on a bike and have a gun, and would certainly be inclined to use it as described.

A mental health outpatient might conceivably ride a bike, have a gun and shoot under such conditions.

An inebriated offduty police officer who's recently been busted down to bike squad WOULD NEVER be able to do such a thing, however.