The art of holding a sword(EXEPTIONS: weapons without guardkatanas{they have guards, but nothing to speak of in this context}) by its edge, using the pommel/guard to make a makeshift hammer.
How to use the Murders stroke in combat: Imagine this: You're facing a knight in a 16th century steel plate armor, and you're only armed with a sword.
What do you do?
Throw a cut at the knight is no use since it will just ricochet off the armor.
What you actually want to go for is grabbing the sword by its edge, and using the guard or pommel to smash into nucks. If there's are nucks nowhere to be found, go for the head.