Set the Standard for "Not to be Fucked With"

Any predator is generally there for the easiest kill. So your goal when dealing with dragons, zombies, or managers is not to be the easiest target. You gotta run faster (Rule 1: Cardio), think quicker, and swing harder. One way to ensure the latter is to make sure any undead you've disabled are actually permanently out of the picture. You can't go by "Does it look dead?" with zombies. They ALL look dead. So a Double Tap is a safe way to ensure your own survival. One, two, and you're done. Move on. Get back to looking for Twinkies.

"Rule 2: Double Tap" in 3D letters with some blood spatter on a black, 100% cotton t-shirt.