I learned this best from one of my favorite chapters in Air Pirates. Hagai (not a pirate) needs the help of Sam (pirate) to find his mother and plans to leave the town of Providence with him. Unfortunately, the Imperial Navy and another particularly nasty pirate named Jacobin Savage don't want Sam to go.
The outline for this part said "Hagai helps Sam avoid arrest then together they escape Providence." But when the time came to write it, I wasn't sure what that looked like.*
It started simple. Hagai boarded their airship just as two Navy ships showed up and starting shooting at them. Fortunately Sam and crew had a clever piratey maneuver to get them airborne fast and out of range. It was a good scene, but it felt too easy.
So I threw rocks.
They escaped the first two ships, but the Navy was ready for them. Over half a dozen new ships came out of the clouds and surrounded them. They attached themselves to Sam's ship with steel wires and started reeling them in.
It was good. It was tense, but now I had a new problem: how would they get out of it? Whenever you throw rocks, you'll run into this, but that's when you know you're doing it right. If the situation isn't impossible, it means it's too easy.
I won't tell you how they escape (hint: it gets worse before it gets better), but I will say that what started as a clever-but-simple maneuver turned into one of my favorite battle scenes in the entire book. (In fact, I had a hard time topping it for the climax...I'm still not sure I did). All from throwing rocks.
To sum up:
- When the story is slow, or you don't know what happens next, or things feel too easy: Throw rocks at the characters.
- Throwing rocks means: Every time the characters think they're okay, make something even worse happen.
- When the situation looks impossible, you're doing it right.
* It's true, my outlines used to be really vague. They've gotten progressively more detailed the more novels I write. But no matter how detailed your outline is, eventually you do have to make up something.