Gazef - Various Buffs 2

In actuality, his arms were starting to feel heavy and his heart-beat was becoming irregular. Instant Reflex would take his body thrown off-balance by the previous attack and force it to return to attack stance. That made it possible for him to attack immediately, but the forced posture changes were a large burden on his body.

Flow Acceleration temporarily increased the speed at which his nerves worked, so he could attack faster, but extreme exhaustion was mounting in his brain.

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Volume 1, Chapter 4.4