Exactly, if they had a suspicious person they were tracking and had lost sight of. You would THINK that they would of already alerted all the SS, the snipers, everyone to be on high alert and maybe even paused the rally until all was clear but, nope... crickets until gun fire. Well, but for the several civilians who were actually yelling about the guy with the gun on the roof for a good chunk of minutes before the shooter was in position and firing.