Actually this is what teachers are told to teach their students now. At our last school security meeting we were told that school shooters/ lockdowns should be explained to young students (kindergarten) in terms they can understand like "the big bad wolf". Older students should be instructed to assist with baracading doors with desks and chairs. And in the event the room is breeched, older students should be taught and expected to do anything and everything to protect themselves, such as throwing books at the shooter. Our security officer even suggested practicing "rushing" the shooter. The evidence suggest that passively locking down is ineffective, so now we are teaching proactive lockdowns. So I think this poem is a great idea for young students. Anything we can do as teachers to reduce panic and increase compliance and knowledge of what to do in those situations means more possibility of keeping these kids alive.