[Kiai]

Wikipedia had this on gun kata: Gun Kata, as a martial art, places emphasis on two tenets: shooting the enemy as efficiently as possible, and avoiding return fire. Hitting targets is a matter of knowing where enemy fighters are likely to be located in relation to the user, which removes the problem of aiming (especially at close ranges), not to mention allowing the user to defeat foes with pre-emptive fire before they can present a true threat. Avoiding return fire is also a matter of statistical probability, as Gun Kata users do not rely on bullet time-style evasions, but rather on avoiding the enemy's most likely lines of fire. In short, Gun Kata is the art of shooting where the enemy should be, while not being where the enemy should shoot.

I think I caught on to this style after seeing the final episode of Grenadier. The clip of their fight is here:
http://www.youtube.com/watch?v=cIOxsYDHWGc

There is a further clip of a movie called Equilibrium which further demonstrates the style:
[url=http://www.youtube.com/watch?v=VkupFNDZ99I][/url]http://www.youtube.com/watch?v=VkupFNDZ99I

Being a black belt in taekwondo myself, I didn't think much about it until a couple japanese guys put on a show for us. Crazy, crazy, out of this world martial arts, coupled with the lethality of a gun (it was a BB gun, but still, it was fucking cool!) made the show beautiful.