Kendo: In my casual reading on the art and techniques after I bought my cheap Highlander katana (
), it was said that a samurai trains to draw the blade, strike fatally, and resheath, in one smooth, artful motion. Which makes me assume that a) the samurai is blindingly fast, b) the other guy is just standing there waiting for it like a schmuck, or c) the samurai has snuck up behind said schmuck.
That art's Iai-do. first-strike tactic.
Of course, the situation if both combatants have blades drawn, and are in a guard stance, is totally different, and that's where the "first mover loses" thing is from