Survival is inherently part of common sense. Common sense dictates that you do what you have to survive. If you watch the video, you can watch the 'hero' incapacitate the robber by shooting him in the head (he was still alive but unconscious), walk slowly over to the counter, pick up a gun, walk back, and unload 5 bullets. This clearly goes far beyond self-defense, common sense and survival. This steps into the realm of execution-style murder.