It’s funny. I had something akin to this experience in college, except that there was no shooting or running around, or anything of the sort.
I worked at the Subway on Prince in Athens, Georgia, when my future self appeared in the shop and ordered a Cold Cut Trio (TM). He looked bored. It inspired no emotion in him when he looked me in the eye and asked for extra mayonnaise. I was all “Hey, future self, what the fuck, man?” And he was all “Hold the lettuce.” I tried to ask him about the next few years, but he waved me off. He looked tired.