Package it with a safety curriculum, and people should watch it to know what to do. In particular: For the most part, those people in the video who ran, lived, those who tried to drop low, or froze up, died. (There were a couple of exceptions.)
Additionally, one guy tried to attack the shooter and was killed. But it was just one guy, everyone else was too scared. If instead they had all attacked, some would have died, but not as many.
(It sounds like I'm blaming them, I'm not.)
There are a lot of safety lessons in that video, and people should watch it.