An armed man, especially if he is armed with a firearm, is dangerous as long as he is conscious. Take no chances. Put him out.

Use your eyes. Do not enter unfamiliar areas that you cannot observe first. Make it a practice to swing wide around corners, use window glass for rearward visibility, and get something solid behind you when you pause.

Under any sort of attack, keep cool. And if you must shoot, shoot with precision.

If a felon attacks you and lives, he will reasonably conclude that he can do it again. By submitting to him, you not only imperil your own life, but you jeopardize the lives of others.

Anger, as long as it is controlled anger, is no obstacle to efficiency. Self-control is one thing the sociopath does not usually possess. Use yours to his undoing.

Safety is something that happens between your ears, not something you hold in your hands.

What you do to prevent further felonious assault, as long as the felon is still capable of action, is justified.