What could have happened is:
The guy could have been returning home from the shooting range, walked into the store and realised that his AR15 was in plain sight. Knowing he could legally open carry he returned to the car and got the rifle, which he slung over his back (not carrying it in his hands - therefore no threat). On going back into the store he saw that everyone was freaking out and left.
No grandstanding for the second amendment may have occurred. We really don't know.
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