Once again in this summer of slaughter, Americans struggled to parse helter-skelter fragments of information: A rifle-wielding shooter clad in black near Baton Rouge police headquarters. A robot searching for explosives. "Seventeen or so" people huddling for protection in a bathroom at Benny's Car Wash. Even a rush of officers to lock down Our Lady of the Lake Regional Medical Center as surgeons operate on the casualties. And a sobering radio request that cops on the scene look for still more victims: "I need eyes to see if we have any other officers down, so check around and see what else is around you."