"the man originally entered the store unarmed, then went back to his car and retrieved his rifle. He then walked back into the store... "
To some, that would be considered reconnoitering. And a signal to go from condition yellow to condition red.
There are at least two sides to every story. I just heard yours and, indeed, you appear to be the victim. But I can't stop wondering what the other side has to say.
Oh, g-d, if only LEOs can be indemnified from willfully ignoring the stupid!