There are many different versions of the so-called teacher’s oath. Many of them mention education, support, compassion. None of them mention active-shooter training. Yet, to be a teacher in the United States these days is to confront that very nightmare — as Andrew Scott does in this understated gem.

This will be what I take away from the presentation: One day students will be bleeding out on my classroom floor, and I will have to stuff so much cloth into them. I will have to wrap more cloth around their extremities, stanching the awful bleeding. Where will I get so much cloth? Will I take off my work shirt, shred it into pieces? I’m not even armed with scissors.