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If X gets hurt in a fight, recovers, gets hurt in a new fight, recovers again, etc. that is going to start to get boring. If you want to avoid boring your readers, fights need to have consequences...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/37198 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/37198 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
If X gets hurt in a fight, recovers, gets hurt in a new fight, recovers again, etc. that is going to start to get boring. If you want to avoid boring your readers, fights need to have consequences. In your story, that's not death, but it could be a lasting injury, or a damaged plot relevant item. X doesn't have to recover, or not completely. Especially if they're getting hurt badly. Even with sci-fi medicine, plenty of injuries probably can't be healed instantly. Not to mention the mental traumas such as PTSD that can happen. If there are lasting effects from the fight that affect X in later scenes, it gives the fight scene a better sense of purpose. Maybe the leg wound they got in chapter one prevents them from climbing to safety in chapter three. Or the concussion they got means they're unable to drive and can't follow the bad guy.