Let me get this straight . You have a gun in your hand ready to defend yourself and you are positioned where you could defend yourself before he actually bust your door open and he still gets into your house runs into your kitchen and you make physical contact with this guy ? I wasn't there but I can't see it going this way if it were to happen to me. Maybe I read your post wrong but if the guy busted your door down while you were in a good position waiting and ready to defend yourself and he still gets in, runs through your house, makes physical contact with you and runs out of your house, I don't see where you ever did anything to defend yourself of your girlfreind. I hope you called the police and are at least pressing the burglary charges. Like I said I wasn't there and I'm withholding judgement ( kinda) untill I have more info. Glad you were not hurt though.