I second that emotion. IDK how long it took for me to get over having a gun put to my head during what I thought was a carjacking, then when they wanted to put me in the trunk thought "Better to die here and people know it than end up a charred mess, or not even found, later". So I made my escape to the neighborhood next street over. Still alive, despeite the younger one saying "shoot him!". I looked back and the gunman was looking at the gun, I don't know if they couldn't figure out the safety or forgot to pull the slide to load the chamber, but either way I didn't get kidnapped or shot.
I can't imagine what it must be like having bullets flying all over the place, seeing friends and enemies getting killed.... I'm sure all of it would mess me up for a long time. I had to stop watching "murder mysteries" because of the nightmares after my incident. So IMO PTSD is something almost anyone who was in a war zone must suffer for at least some period of time.