Luffy activates his Gear 4 form, which causes his torso to balloon and makes him constantly bounce. While Doflamingo initially laughs at this new form, the power shift is immediately apparent.

Luffy successfully lands heavy blows on Doflamingo, shifting the tide of the battle and forcing the Warlord on the defensive.

It is highly regarded as a satisfying payoff after an extended fight, with fans appreciating the unique, almost comedic nature of the "Boundman" form contrasted with its immense power.