That's why there should be a SS agent at each zone location. Someone needs to coordinate the security. If the middle or outer zone discovers a threat, they need to immediately inform the inner zone so the VIP can be brought to a safe place. If they are not doing this, they are not security professionals. A SS agent would have told the local PD, "Yeah, its hot. So rotate your rooftop observers, but never leave the spot empty." Proper defense in depth requires communication between the zones.
That's why there should be a SS agent at each zone location. Someone needs to coordinate the security. If the middle or outer zone discovers a threat, they need to immediately inform the inner zone so the VIP can be brought to a safe place. If they are not doing this, they are not security professionals. A SS agent would have told the local PD, "Yeah, its hot. So rotate your rooftop observers, but never leave the spot empty." Proper defense in depth requires communication between the zones.