Sounds like they stopped the operator, not the drone. If the operator hadn’t been in plain sight, what would they have done?
It’s been years since someone plotted to attack the White House with an explosives-laden remote control plane, and that was before these drones were widely available. Seems like they still have no contingency plans for such a scenario.
Put a few South Louisiana Duck Hunters in the motorcade. Drone hunting at its best. They would be much easier to hit than a duck.