 They don't have a common communication chain. They're not even the military does because we learned that the hard way with the raid in Tehran, the Delta and C-166. But they didn't have communication comms. But this, when the cops saw it, if he did holler a mayday or shoot on the roof, it probably went to his local dispatcher. And that loss of time, not getting to the earpieces of the Secret Service agents on stage, prevented them from taking any immediate action.