Everyone knew his job. Silence was key. Radio calls were prohibited. “Talking is too slow,” says Davis. “It complicates things.”
I distinctly remember this feeling from when I played competitive paintball. At the speed you need to move, needing to vocally communicate added a lot of information latency. You have to learn to anticipate what others will do and trust they will react to certain situations in a way that you expect. When this happens everything works seamlessly.