I think he maybe in trouble, since he went to another man's house armed and this could be construed as he is the instigator. He went to the trouble, the trouble did not come to him. The whole thing could have been avoided had he waited for the police. Loud music is not a threat to anyone's life. Also the party goers were drunk and you never argue with a drunk person.
Just my opinion, maybe I am wrong. But one dead and two wounded over loud music and noise ? I wouldn't consider loud music and noise as a threat of personal injury. He should have waited at his own house for the police and let them handle it..