Luffy Gear 4 Episode _verified_ -

A shockwave rippled outwards, shattering the remaining windows of the palace. The steam became a vortex. When it cleared, the ground was scorched in a perfect circle.

His arm didn't just swell. It distorted . The bone, the muscle, the very concept of his rubber body screamed as he forced his Haki—the hardened will of the conqueror—into his musculature. It wasn't air he was inflating. It was his resolve . luffy gear 4 episode

Luffy’s crew, his friends—their cries were distant echoes. He’s not getting up. He used too much Haki. King Riku’s voice was a grim prophecy. A shockwave rippled outwards

"Don't get up, Mingo. Because next time... I'm aiming for the sea floor." luffy gear 4 episode