>>16653462 (pb) (guidestone shot)
That's a tank-like gun. The muzzle flash; the debris pattern; the obvious shockwave dusting up the area in front of the barrel and beyond. Situational awareness. Light/camera positions known. No roping off the area; it's trivial to reconstruct the damage pattern and use IMS/MS to detect the explosives, but nope, tear it down. In this case, it's a large bore, high enough to be behind the light. Like a fuckin' tank. Not a RPG. Big muzzle flash. See tell-tale dust up under the barrel. This is the best timeline.