I witnessed a disturbing incident yesterday afternoon. A pedestrian was crossing Bryant Street in a crosswalk and was about half way across the street. An older man in a car came up behind the pedestrian and started blasting his horn, presumably because he thought the pedestrian was not walking fast enough across the street. The car was not there when the pedestrian started crossing the street. The pedestrian was obviously startled and stopped and turned and for a moment, I thought that he was going to put his fist through the driver's (closed) car window. But the pedestrian apparently decided not to, and continued across the street.
12 hours later, this incident is still bothering me. What should I have done? Unfortunately, I do not recall the make or model of car or the license plate number. Should I have called 911 immediately to report an assault on a pedestrian? If I had the license plate number, would the police have arrested the driver?