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He does it when emotions are high, not always.The reason why it is passive is that development starts automatically as soon as the war begins. This only happens automatically during the war, and development stops as soon as the war ends. And not only does his strength increase, but Saitama's speed, strength and durability also increase exponentially in this process. We can understand this from the fact that saitama has superiority over Garou in terms of speed and strength from the moment the battle started. The reason why Garou was able to keep up with him even a little bit (in fact, In fact, he couldn't even keep up properly.) was because Garou was constantly copying Saitama.