You have an oppurtunity to ambush said invader and do so, hurting seriously or killing the person in the act.
I would have to say in this specific instance you DO have the opportunity to control the situation. If you have the drop on him your first attack would be of your choice. So, with even a medium level of training you should be able to incapacitate but not kill, by choice.
If your initial attack fails and it then becomes face to face you do lose a certain amount of control over you choice of attack, theoretically 'responding' to the type and severity of the attacks you are recieving without as much forethought.
Specifically, if it is an intruder in your home, no matter what happens in the course of the engagement, if you win, make the scene look like you had to do whatever you ended up doing. Before you call the cops.
What I am getting at is, couldn't the law view us potentially as experts in the field of self defense and reasonable force?
I'd buy that. And your defense lawyer should surely be using that angle. But, of course, the other sides lawyer will be using the aforementioned approach.
"George never did wake up. And, even all that talking didn't make death any easier...at least not for us. Maybe, in the end, all you can really hope for is that your last thought is a nice one...even if it's just about the taste of a nice cold beer."
"If you find the right balance between desperation and fear you can make people believe anything"
"Is enlightenment even possible? Or, did I drive by it like a missed exit?"
It's simpler than you think.
I could be completely wrong"