Natori teaches that speed is more valuable than power in combat. A slower, more powerful strike will lose to a faster, less powerful strike in the vast majority of encounters. The reason is temporal: if your strike reaches the opponent before his strike reaches you, you damage him first. He must then react to being damaged while you remain intact.1
This seems counterintuitive — a powerful blow seems obviously better than a weak blow. But Natori's point is about the encounter's sequence: two warriors exchange attacks. The one whose attack lands first gains an enormous advantage. The opponent is injured, off-balance, or dead before his attack connects.
Speed converts inferior power into superior outcomes. A fast, weak strike that lands first beats a slow, powerful strike that never connects because the opponent is already incapacitated.
The principle operates at multiple scales.
In single exchanges: Two warriors face each other. One is strong and slow; one is weak and fast. The weak, fast warrior attacks first. His strike reaches the strong warrior's body before the strong warrior's strike reaches the weak warrior's body. The weak warrior's strike does modest damage. The strong warrior, now injured, fires his powerful counter-strike — but from a compromised position. His strike is slower because he is injured, and the weak warrior moves out of range.
In extended engagement: Over the course of a fight, the warrior who consistently gets his attacks off first will deal more cumulative damage. It does not matter if each individual strike is weak — ten weak strikes that land first beat five powerful strikes that land second.
In group combat: In battles with multiple warriors, speed determines whether you can engage multiple opponents sequentially. A slow warrior can only fight one opponent effectively. A fast warrior can injure one opponent, disengage, move to the next opponent, and engage multiple threats. Over the course of a battle, this compounds.
Natori acknowledges specific contexts where power becomes more important than speed:
Against armor: A weak, fast strike that bounces harmlessly off plate armor achieves nothing. In heavily armored combat, power becomes necessary to penetrate or break armor.
Against distance weapons: Speed matters less when the opponent has a spear, bow, or pole weapon that keeps you at range. A distant opponent cannot be reached by speed alone.
Against large strength advantages: A warrior facing an opponent twice his size and equally fast will lose the power exchange. Speed cannot overcome unlimited mass differential.
Against prepared defense: An opponent who has time to fully prepare a defensive stance can absorb speed. The advantage is smaller when the opponent is ready.
But in open combat between warriors of similar size and conditioning, Natori repeatedly returns to the same principle: the faster warrior wins.
If speed is primary, what follows for training?
Natori teaches that speed comes from nervous system efficiency, not muscle power. The fastest warriors are not the strongest — they are the ones whose nervous systems can coordinate movements with minimal lag. This means speed training emphasizes:
Natori explicitly de-emphasizes heavy resistance training if the goal is speed. A warrior building strength through heavy weights may become more powerful but slower. A warrior building speed through light, fast repetitions may become less powerful but far more effective in combat.
Speed doctrine integrates with Natori-Ryū Operational Doctrine in that many of his specific techniques are designed to be fast. Throws that work through momentum and precise positioning are faster than brute-force grappling. Strikes to pressure points work quickly because they require precision rather than power.
The doctrine also connects to Footwork and Stance Positioning — footwork is one of the primary determinants of combat speed. A warrior with excellent footwork can move faster and change direction faster than a warrior with poor footwork.