Input/Advice on a real life scenario.
You are sitting in a small downtown coffee shop when a man walks in and stabs a worker in the neck one time with a steak knife and then runs out of the store. "How do you react?"
Above is what happened and I'm sure it took place in a matter of seconds. I doubt one could have perceived this sort of attack coming and just so you folks know the man was found incompetent to stand trial. Turns out he has the mental capacity of a seven year old and also suffers from hallucinations.