Pretty crazy and the guy that got hit doesn't want to press charges it said so no arrest was made. It doesn't work like that though in Law. It is up to a Prosecutor whether or not charges will be filed for Assault and Battery, I am sure they will after looking at the video.
Completely uncalled for, he’s lucky the guy didn’t hit his head and die. Happens a lot. Yes It would have been different if the guy he hit was in a fighting stance or swinging, but to sucker punch the guy, especially over a baseball game I presume, is asinine.