There are Rules to hunting. These rules are important, and if anyone should ever go hunting these rules should always be at the top of their mind.
1.) No people should ever be put in danger by your actions. It doesn't matter how many lives you've saved. if a single person is hurt by your bad judgment, you should hang up your stake immediately. You're done.
2.) Do not break the law to catch a vampire unless it is completely and absolutely necessary. Don't trespass, don't vandalize, don't speed, don't do anything like that. It attracts attention. It is dangerous.
3.) Don't fight a vampire in public. See above; it attracts unnecessary attention. Also, fighting in public view can lead to people being hurt. See Rule 1.
4.) Vampires are not good. They are not sexy. They are not charming. They are not good-at-heart and you cannot make one into a good guy. This rule gets forgotten a lot by newer hunters, who die at the hand of a vampire with a kind demeanor and a good poker face.
5.) Only attack after you are certain your prey is a vampire. If there is the slightest doubt, discontinue the hunt.
6.) Dispose of the vampire completely. No dumpsters, no trash bags. Set it on fire, turn it to ash.
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8.) Keep your equipment in top shape. Shoddy equipment leads to death.
9.) If things go bad, run. And they do, often. Take no chances. Get good at running.
10.) Never let your guard down. At least, not until the sun is up.
That's all I can think of now. If I think of more, I'll post them.