Unexpected Hostility

At 10:16 p.m., I was driving north on 21st Street behind a small black sedan carrying several people, when the front-seat passenger stood up, leaned outside the window, and flung a bottle directly at a pedestrian just north of, and walking away from, the Press Club, at P Street. The nonplussed pedestrian didn't flinch as the bottle shattered on the sidewalk. The car turned left at L Street.

Didn't get a make of the car, but I did get a plate: 3RWD570. Called the police - who knows what's next?