How to survive if a shooter comes into your work, school, theater, church etc.

I have long been aware that not all my neighbors share any sort of popular opinion for firearms.  You are all welcome to that opinion To each his own I say. However please do not let that prevent you from glancing over this safe tips video.
 It addresses what to do if you are confronted with an armed person who is someone who is not law abiding, not one of my good neighbors, just a little crazy, or high on drugs  I respectfully ask that you watch it given the current times we are living in.
  It has nothing to do with owning guns, buying guns, CCW classes, gun laws, or anything controversial. It is about how to survive if a shooter comes into your immediate area at work or possibly school, a movie theatre, church etc.
My goodness! As I look back over that last sentence I cant believe I live in a time when you have to write all those names into places that are considered a risk for shooters. What a mess our world is in.
Of course I do not suggest that you not follow your employers policy or school policy. This is just another piece of information for you to have in case you can use it to survive. Do what you believe to be right.
I hope you never need it, but I felt it could not hurt to spend five minutes on it..
It is extremely well done to be so short.  Best wishes to you all.