Screenwriter Markus McFeely dropped this gem in the director’s commentary of Avengers: Infinity War: Scenes need to do more than one thing. He acknowledged that the events of a scene need to happen, which is its primary reason for appearing in the story. But a scene can also do other things like set up a character conflict, inform you about some backstory or exposition, or somehow advance the plot point in another way—all things that McFeely suggests that screenwriters employ. This was an...