I am working on this short espionage story, and I have one character, an agent, who is unable to bring himself to do harm let alone kill another person. He's never done the deed himself. In my storyboard he'll encounter a situation where his partner does kill somebody because of necessity (If he doesn't, they'll die--type of situation). And this causes a little problem where he keeps replaying the scene in his head and it causes him stress.
I want to be very careful writing this scene. To my knowledge, people suffering from PTSD can have hallucinations of a traumatic event, and I don't want my character being seen as having PTSD when he doesn't have one. I know this is a sensitive matter to handle so I truly want to approach this with caution. And avoid accidentally writing a bad handling of PTSD at all costs. Which leads me to this stump.
Does anyone have tips for this? Thank you!