Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title
One example: 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 is here: What's the meaning behind the phrase "The blood stays on the blade"?
Explanation: 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

Now, solve this: In the movie Arrival the aliens say that they will need help in 3000 years. What for? Is it implied or mentioned in the movie because I didn't catch that part. Is it mentioned in 'Story of Your Life' that is the short story the movie was based on?
Solution:
What did the aliens need help for?