I dunno anything about shooting but long ago an athletic group I was involved with tested reaction times of group members and found that some are just wired to have faster reactions than others. No surprise, of course. Your reaction speed will stay with you until your nervous system starts to degenerate.

You can see a real world set of reaction times at every stop light in the form of how long does it take the person ahead or next to you to get off the brake and on the gas after the light goes green. It’s usually about 4 seconds.

Also, by my stopwatch this took about 2 seconds. How does the person come up under 1 second?