Here's my take on the situation. A common sense perspective for ya.
Moose, good job on defending yourself.
As for "oh, boohoo, you can't defend your property!", civilized Western society is based on the ownership of property and the respect of that property by others. If somebody want's MY stuff, they're gonna have to work damn hard for it, because I'll MAKE them endanger my damn life to take it!
As for this dude being unarmed, Moose had already been hit, IN THE BACK OF THE HEAD. I don't know about you, but I've heard of cases of people dying from that alone. That assault proves intent to do bodily harm, and in my humble opinion justifies a response of equal or greater force. Then again, people try to say I'm a bit old school when it comes to these things. The classic "I've kicked people's butts for less" type, I guess. Not to mention, at night, there's no telling what someone could be carrying.
And then comes the classic addage "Better to be judged by twelve than carried by six." I'll take time in jail over time in the ground any day.