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Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

At the beginning of the movie Gangs of New York, Priest Vallon tells his son not to wipe the blood of the blade after he's cut himself shaving, saying "The blood stays on the blade". I've watched the movie multiple times, but can never find what the meaning behind that phrase is. Anyone able to shed some light on this?
Solution: What's the meaning behind the phrase "The blood stays on the blade"?
Why? A person gives a detailed description about a scene from the movie Gangs of New York and asks the meaning of a said phase in the scene. The question is summarized as What's the meaning behind the phrase "The blood stays on the blade"? for easy indexing the next time someone searches for a similar phrase

New input: In season 3 of Game of Thrones, Daenerys Targaryen buys Unsullied in exchange for one of her dragons. After turning over the dragon's leash, she is handed a decorated whip as a symbol of ownership. She then orders the Unsullied to "Slay the masters,... slay every man who holds a whip..." The Unsullied stand motionless as Kraznys mo Nakloz, the seller, screams back at them to kill Daenerys. She then commands the dragon to incinerate Kraznys, after which the Unsullied sack the city. Is the delay before the initial attack simply for cinematic effect? Or did Kraznys train the warriors with a fail-safe, to refuse any order to kill him, which required him to be dispatched first? If the whip gives command, how can Daenerys order them to kill other whip holders? Couldn't one of them countermand the order? Or are they motivated by revenge against their former masters?
Solution:
How do the Unsullied prioritize their orders?