Animation Speed! Go to the Downloads section, then JASS/Triggering Stuff... Nevermind I'll just link you. Here you go. Download it and look at the Blademasters spells, Have fun!
Now wait a god damn minute, that was't helpful at all, I DONT KNOW ANYTHING ABOUT JASS only triggers all i want is that, not some friggen blademaster spells
when you mean "matrix" style fighting do you mean slow fighting ? With a trigger you can make a unit play it's attack animation 25% of its normal speed or less and make it do damage through triggers
Don't animation speeds change with movement/attack speeds as well? Wouldn't casting a slow spell that decreases movement and att speed to 25% reduce the speed of animations in the same way as using triggers (well, you still need triggers to cast the slow, but anyway :) )? Or maybe just use a negative endurance aura?
Edit: oh, right, there is a minimum speed to which unit's can be slowed down, but i guess that can be changed as well?