He put on a sweatshirt with “Navy” emblazoned across the chest and a Navy ballcap, figuring the federal officers would be, like him, a military veteran. He figured they’d listen as he reminded them “that you take the oath to the Constitution; you don’t take the oath to a particular person.”

“What they were doing was unconstitutional,” David said. ”Sometimes I worry that people take the oath of office or the oath to the Constitution, and it’s just a set of words that mean nothing. They really don’t feel in their heart the weight of those words.”

There was no talking. The federal officers, in full tactical gear, came charging out of the federal building.

“They came out in this phalanx, running, and then they plowed into a bunch of protesters in the intersection of the street and knocked them over. They came out to fight,” David said. One officer pointed a semi-automatic weapon at David’s chest, he said, and video shows another shoving him backwards as he tried to talk with the officers.