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Have a third party observe his actions and let them linger on the MC's reasons for doing what he did. This way you can let the MC be oblivious to his own reasons for sparing his enemy, while the re...
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Source: https://writers.stackexchange.com/a/39931 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
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Have a third party observe his actions and let them linger on the MC's reasons for doing what he did. This way you can let the MC be oblivious to his own reasons for sparing his enemy, while the reader becomes aware of it. This technique is also seen a lot with unlikeable antiheroes. A third party explains why the things they do are for the greater good (or a lesser evil). And there you go. You can also find examples in the many interpretations of the stories of Sherlock Holmes and Dr. Watson.