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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 Never Back Down, I don't understand the relationship between Max Cooperman and Ryan McCarthy. At the beginning of the film scene they appear to be on good terms Ryan is observing the fight Jake interrupts Max and Ryan are very friendly at the party However later in the film he becomes friends with Jake and the rivalry develops He sees (and presumably knows) Ryan beat up Jake in the bathroom He's aware of the rivalry and Ryan's determination He knows of the friction with Baja/Ryan/Jake Knowing this why would he agree to join Ryan at his house (leading to his hospitalisation)? It he being naive or is this simply being used to tell the story?
Solution:
Are Max Cooperman and Ryan McCarthy friends in Never Back Down?