Hate to put it this way, but here it is: get his plates, turn him in.
No, nothing would really happen to him. This time. But if he pulls a similar stunt again and does hit a cyclist, he'll have a record of behaving that way.
Which is why I turned in one of my neighbors who got out of his car to yell at me. I don't need a crazy moron zooming around at dusk with no lights on down streets where kids play, much less one aggressive enough to get out of a vehicle to threaten someone.