The premise is bullsht, and this man did himself proud. He stayed calm, reasonable AND kept asking the crucial question, "Am I free to leave?"
The more people who exercise the right to open carry, where our betters have deemed it legal, the better for everyone -- the cops get used to seeing the peaceable, openly armed; the people get used to seeing guns openly worn; and the kids are educated in what a citizen, not a subject, looks like.