you will know when its 'hot'.......i was instructing a night flight in a multi when a back seater stated something along the lines of "what the hell is that". so all of us in the plane were starring out the window when all of a sudden a red line was pointing at something in the mountains. after watching for a bit, found out it was a helicopter shooting at swamp rats(star wars lol). not sure what the chopper was shooting at but looked like fun as long as you weren't on the receiving end of that gun fire.