Most authors don’t think about poetry when they’re writing, but they’re well aware of the flow of words, how the words will sound and the rhythm behind them. A battle scene uses smaller, focused words. A love scene (usually) uses softer, smoother words.
For most people the rhythm of language is instinctive. We use it all the time in conversation, in e-mails, in other forms of writing, but for some reason when we sit down to write we think that we need something different.
We don’t. Think of the last argument you had. Did you stop to think about how to make the words flow? I doubt it. And yet the argument moved without a hitch. If you have an argument between characters it’s going to flow in a similar way, with similar words and emotions.
I doubt that you took time to elucidate the abstract considerations of the debate or describe the color of the walls. Um…no. So in writing an argument, description comes far down the list–unless the argument is about the color of the paint, your characters are not going to notice. Nor will your readers, if the scene is constructed properly.
When I think of a battle, I’m thinking lunge, thrust, crunch, dart. Single syllable words that make the reader move faster through my prose. Short, punchy sentences because the scene is moving fast in my head.
In an emotional scene I don’t necessarily want the words to flow faster–I want to give my readers time to absorb what is happening, to experience it. So I choose words and structure sentences that will create a setting and a mood–far more setting and mood than I would use in the battle scene.
People in a battle are going to be paying more attention to their footing and avoiding that sword than to the color of the sky or the fact that their father is missing. Those are considerations for after the action.
You really don’t want people getting lost in your lyrical prose while a sword is swinging toward your MC’s head. You also don’t want your readers speeding through an emotional goodbye scene.
Pacing, rhythm and flow are mostly about scene logic–they should be instinctive. Just like a conversation, if we choose the correct words and structure we’ll end up with a scene that flows and leads readers through to the next, without drawing attention to the fact that it was carefully constructed to do so.