One of the threads I've really been digging into as part of an ongoing project is the idea that shooting doesn't change regardless of your circumstances. By that I mean the mechanical act of aligning the sights and pulling the trigger is the same if you're on the range or someone is kicking down your door at 3am. The only thing that changes is your environment, which can influence the act of shooting.
It got complicated so I had to draw it on a whiteboard