From the not-always-so-pretty-world of Corporate Security and Protection comes M with a series delightfully called: Black Arts for the Good Guys.
Straight forward hints like: "One other thing. Always...always pack a decent high lumen flashlight like a surefire , a l.e.d. headlamp and extra batteries for both." are plentiful, as are hints that you might never had thought of, "Recover the weapon and kill them right then and right there." Practical advise when you don't know what's around the next corner.
Normally I tend to stick to the sporting, but with many of us having to travel for work and occasionally for fun, being prepared is cheap insurance.