Fortunately, Mousse was there to explain: "Opening with a big move is both a show of force and a test. Once they realize their opponent is no weaker than themselves, using big moves again would be foolish. A swordsman's attack power is actually excessive. Put simply, when two evenly matched swordsmen fight, if one fails to block and gets cut directly, the other does not need any big move at all. A casual slash can take their life."
"Therefore, rather than wasting Haki on big moves, it is wiser to use it to maintain the strength of Observation Haki and avoid being cut by the enemy. This shows that both of them are truly battle-hardened."
When Mousse saw the bewildered looks on both their faces, he could only launch into another on-the-spot lecture on the basics of Haki. Fortunately, the duel lasted long enough that it did not interfere too much.
"So the Observation Haki you mentioned is the Voice of All Things, the breath of all things!" Zoro immediately lost interest upon hearing that. Since his master knew Haki and had even demonstrated it for them, then his failure to learn it merely meant his training was insufficient. There was no use asking an outsider like Mousse any more questions.
But Kuina remained cautious. This mysterious boy claimed to have mediocre talent, yet he had trained his body to surpass even the exceptionally gifted Zoro. Did he perhaps have some unusual method for training Haki as well?
However, it was inconvenient to ask while watching the recording, so Kuina could only suppress the thought for now and finish watching the battle between the two Grand Swordmasters.
Since both sides had chosen the safer strategy of waiting for the other to make a mistake, the battle continued for several hours.