Oh yea
It depends on what the scenario was. You can go to jail for assault if you just hauled off and socked somebody but if it was a mutual fight and he lost, then you have nothing to worry about.
Actually it depends on who threw the first punch. It does not depend on the words that were exchanged before the blows began. It only depends on who became violent first. If he hit first and you were defending yourself, you are off the hook. If you hit first...you are in trouble.
You can if you put your hands or hand on him/her first. That is Assault & Battery. However, if you were defending yourself, NO.