Then, it happens.
"W-What is this pressure?!" a Marine screams. luffy using haki in marineford episode
Even the executioners hesitate. Sengoku, the Fleet Admiral, narrows his eyes. "Don't panic. He’s not the one doing it…" Then, it happens
When you rewatch Episode 473, don't see Luffy’s Haki as a victory. See it as a curse. It’s the universe showing Luffy the throne he could sit on—right before it kicks him down into the abyss of despair. the Fleet Admiral
He uses it three times in the arc (anime episodes 473, 484, and 489). Each time, the pressure wave grows stronger. But each time, it’s too little, too late. He knocks out rows of Marines only to watch Akainu punch a hole through Ace’s chest moments later.