BUT hey! If the government took away our guns, there would be no problems to run, hide, or fight with.
On a more serious note, that is an amazing training video that all people need to see. It happens in the blink of an eye, you should always have a plan in place whether it be school, work, or wherever. Know your routes and tools around you ahead of time. It's hard for the average person to keep their cool in situations like that.