Unarmed will not figure. There were three of them. One is not required to abide by Marquess of Queensbury rules when set upon by a crowd.
“Yes sir - I was in fear of my life. And my dad’s life. These three men barge in, all dressed in black with masks on. I saw at least one knife, I figured they had guns.”
“Now son - did you see a gun? What made you think they would have a gun?”
“Well, I figured if they were going to attack a fellow holding an AR-15 they wouldn’t be so stupid as to just bring a knife!”
(No - I DO NOT advise making those comments to the police!)