Head-Royce school recently provided the NSC with a copy of its "Security and Emergency Preparedness Manual, 2017-2018."  See Excerpt from the Manual regarding Evacuation Procedures (p. 13, pp. 90-93).

The HRS Manual addresses getting students, teachers, faculty and visitors from classrooms and offices to the playing fields for a head-count.  It does not address how people are to evacuate the school premises after the head-count.  There is the potential for chaos if plans for evacuation of the school are not coordinated with the evacuation plans of the Mormon Temple, Greek Cathedral, Ability Now and the residents of Lincoln Avenue and the streets feeding into Lincoln Avenue.