Being a former high school teacher, my three years of experience does not compare to the time that my colleagues, teacher friends and family, even my parents, have invested. However, in my three years, my school went into “lock-down mode” quite a few times to keep our students safe when someone had escaped from a nearby mental health hospital, or when police activity was high in the nearby neighborhoods.
The thing about lock-down mode is that we (the teachers in the classrooms) never knew what was going on until after the lock-down had been lifted. Being the only adult in a classroom full of teenagers during lock-down is terrifying. Every. Single. Time. (The “what-ifs” running through my mind, plus my classroom was the first accessible one off the main courtyard.) But that terror must never show, because they look to you when they’re afraid.