Sorry when I'm going all-out nerd here, but isn't the quiet eye the exact stance on war which is talked about over and over in Stephen King novels? I'm thinking It, the Dark Tower series, the Talisman (plus sequel), all basically revolve around the theme of the warrior getting more of that introverted kind of alertness - as opposed to getting more fucked up by the confrontations brought upon them - on every step into the madness that their task turns out to be.