While Luffy is held by Jinbe (who is trying to get him to safety), Luffy lets out a silent, guttural scream. A visible shockwave of purple/red energy (color varies in the anime) erupts from his body. This blast of Haki ripples across the battlefield, affecting the following:
This moment was crucial not because of the damage it dealt, but because of who witnessed it. The use of Conqueror’s Haki sent a shockwave through the ranks of the "Greats": when does luffy use conqueror's haki in marineford
Before Marineford, Luffy relied on luck, grit, and the power of those around him. This was the first time his Haki flared up as a weapon of his own will. It proved that he didn't need to be the strongest physically to command respect—he had the "Qualities of a King." While Luffy is held by Jinbe (who is
While Luffy had unconsciously used Conqueror’s Haki in the past (most notably against Duval’s bull, Motobaro), to turn the tide of battle. The use of Conqueror’s Haki sent a shockwave
Here is the breakdown of exactly when and where it happened.