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

[Q]: This question is about "End Times", the twelfth episode of the fourth season of Breaking Bad.  When Jesse learned that Brock had been poisoned, he came over to Walt's house to confront him. Walt opened the door holding a gun in his hand.   Even though Jesse was obviously mad at Walt, in a couple of minutes Walt left his gun on a couch and walked away, which allowed Jesse to hold Walt at gunpoint using Walt's gun.   Was that intentional?
[A]: Why did Walt leave his gun on the couch when Jesse came to confront him?


[Q]: During an after trial meeting, the bosses decide to eliminate anyone involved or with knowledge of the skim in order to keep them from testifying.   The car bombing wasn't authorized and Nikky was the one responsible for that, so why was Sam spared by the bosses?
[A]: Why was Sam "Ace" Rothstein spared by the bosses?


[Q]: I notice that Trevor always cleaned his hands and toilet floor with bleach. He surely kept things clean at home that he always bought bleach, he kept several used toothbrushes to scrub his floor in detail manner, he kept notes at the fridge. But when he past his fridge when there was fish-blood leak on the fridge, he didn't notice the leak until his third passing.   What is the relationship between the bleach and the plot? Why didn't he notice the blood from the rotten fish when he was a bit aware of cleanliness? What is the relationship between the bloody and rotten fish inside the fridge (that he got when he went fishing with one of his co-worker) with the whole story?
[A]:
What is wrong with the bleach and the fish in the Machinist?