As detailed in the One Piece Wiki , the burst is entirely unintentional. Whitebeard, severely injured and coughing up blood, attempts to intervene but fails, leaving Luffy as the last hope to stop the execution. Driven by desperation to save his brother, Luffy lets out a massive scream that releases a wave of . Key Effects & Reactions
Unlike in later arcs (where he uses it multiple times), Luffy’s only instance of Conqueror’s Haki at Marineford is the unconscious burst after Ace’s death. His earlier attempts to intimidate opponents (e.g., staring down the Three Admirals or shouting) are merely displays of willpower, not actual Haki. when does luffy use conqueror's haki in marineford
While fodder fainted, high-tier combatants like the Admirals and Whitebeard were unaffected but deeply shocked by the sheer scale and reach of the blast. Shock Among the "Big Shots" As detailed in the One Piece Wiki ,
The result was instantaneous. Every weak-willed Marine in the immediate vicinity—along with the two Executioners who were about to kill Ace—collapsed unconscious. The crowd was cleared, the execution was momentarily halted, and the path to the platform was opened. Key Effects & Reactions Unlike in later arcs