Learning how other people think can be a key factor in both gaming and real life.
if you can second guess what a player is going to do on either format, you've a better chance of winning that battle.
other things like on COD you can see where one of your players has died, you can try and figure out where they've been shot from and either avoid the same outcome, or use it to your advantage. the same can be said of paintball if you see one of your players has been shot, try and figure out what that means to you and your team