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Ensure there's enough objective external cues to indicate precisely that. For example, did his throat start to sting or his eyes tear up when he saw his enemy in pain? In addition, perhaps have him...
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Source: https://writers.stackexchange.com/a/39930 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Ensure there's enough objective external cues to indicate precisely that. For example, did his throat start to sting or his eyes tear up when he saw his enemy in pain? In addition, perhaps have him confuse his feelings for a similar, but considerably less friendly feeling, like pity. You can get creative too, talk about an internal conflict using his actions; for example, his weapon-bearing hand may shake as he raises his sword/puts his finger on the trigger, before ultimately he lowers his weapon. Perhaps he himself asks 'What am I doing?' - initially it may seem like he's asking why he's sparing them, but on a later read, will be more obviously asking why he was considering becoming a killer for the greater good. There's lots of ways it can be done.