Egged him on means nothing. Did he try to attack him is the only thing that matters. Was it legitimate self defense? We have weird laws regarding that stuff. If someone swings at fails to hit you and you immediately hit them and do damage....you will actually be arrested. And they can charge you. whether they decide to go through and prosecute you once all the info is in....that's another issue. But....if they do.....by law you would be found guilty since they did not do damage you are not able to damage them. Sounds dumb...but that is basically the letter of the law. You could get by if they tell you they will attack you which is actually assault....battery is the actual violence