My question is if the 18 year old attempted a break in, and i shot him dead, would that still be reasonable defense? He was armed but the gun would have been in his front waistban.
I don't know MD specifically but I can't imagine it's that much different from the majority of other states. If an armed intruder breaks into your house you are justified in shooting him.
One thing I was wondering about though - is how important is what you say during the 911 call.
I mean if you end up shooting someone - does it help to say to the 911 operator when you first call them "I'm scared."