This is probably what the director wanted to say. All of Nicholas' evil deeds are due to vices, so the results are getting worse and worse. Since his girlfriend became religious, some things are going in a good direction.
The director is religious!
The fish at the beginning is in a water glass, and a suicide man appears at the same time. The end is at the aquarium bar, a much larger water glass, two detox people, immersed in it. What is the dream of a fish? Or the expanse of water!
Welcome back Nicholas! This is much better than the Prophet of any scientific religion!
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