TexasCHLforum.com

I hear where you're coming from on the number of rounds used. That may have very well been a result of intoxication.

There are spiritual reasons for avoiding drunkenness, but this appears to serve as a practical reason. Not only do we lack sufficient fine and gross motor skills while under intoxication, but we do not have much control over our mental and emotional faculites.
As for whether deadly force was necessary, I think that anytime someone breaks and enters a person's sacred space (their private residence), its grounds for deadly force. Unfortunately, you simply don't have the time to determine whether or not the person is truly armed, or assess whether or not the person could overpower you.

I don't think he can get into trouble for the calf shot in that situation unless the roommate presses charges, which is unlikely, given the circumstances.
I would certainly rather someone accidentally shoot me in the calf while saving my life than to let someone else kill me.