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

In the television series "Arrow", how come Oliver Queen doesn't rescue Walter sooner than he did?
Why didn't Oliver Queen rescue Walter sooner than he did?

After his wife's death, John receives a small puppy named Daisy in order to cope and provide the company to not grieve alone.  At the end of the movie, after finishing his final act of retribution, John takes with him a stronger built pitbull puppy, and heads home.   Was this an intentional act of symbolism; with his first dog a representation of his fragile state after Helen's death, and the last dog a representation of a stronger, more willful John Wick?
Was John's new dog at the end of the movie intentionally symbolic?

I recently learned about a twist ending, a twist in a plot that happens near the end of a film.  If a twist ending happens near the end of a series of films, is it still called a twist ending?  The plot the led to this question was Harry Potter where we find out Snape is actually a 'good guy. If this isn't a twist ending what could we call it?

Is a twist ending that occurs at the end of a series of films still called a twist ending?