User blog comment:Miskos3/Fairy Tail Episode 180: Garou Knights, Review/@comment-24257713-20140506183830/@comment-4829046-20140507103058

If I were a smart executioner or smart fighter in general, I would take out my enemies before they detect me. The problem of fight etiquette comes in stating that it is foul play not to face your opponent directly but that depends on how you do it in my eyes. If you make sure the opponent doesn't even know what hit them, then it isn't really unethical. Only when they know they were defeated without fairplay does the problem arise. Which is why most games disable stealth kill the moment the enemy turns around, forcing you to take them on head-on.