I realize that laws in some areas border on being insane (ummm, I'm in Kali, remember?), but in a true life or death situation that warranted defending oneself with lethal force there most likely wouldn't be time for a "warning". If there were time for a "warning", there wouldn't be an "imminent & immediate" threat, as most laws require to justify homicide (read: "You didn't *have* to shoot at that moment").
When Banjos are outlawed, only Outlaws will have Banjos
The Bible is my lawbook. I turn the other cheek when applicable, and spend the rest of my days resisting evil at every front, until I have breathed my last breath.