"Had I been behind the counter, and she had hit me with something, and had I been in fear of further great bodily harm or death, CCW and Glock." 2 things about your post:
Number 1, That is really freaking extreme...
and 2, I like the way you think ;)
Is it extreme to use deadly physical force to defend myself against an attack from an instigator who is using deadly or potentially deadly physical force against me?