Reporter Louis Krauss saw this. An agent apparently dropped a flash grenade that was left with the pin still in it on Park Avenue after driving away in a squad car.

Finally, it's wrong AS A MATTER OF ETIQUETTE. Entering a total stranger's discussion and leading with your private anxiety is as off-putting in social media replies as it would be in real life. If you wouldn't interrupt a stranger at a party to announce that America is doomed, don't do it here.