You're fighting Luffy. Currently, you have the upper hand as it seems he's exhausted. You go for a sudden attack, and it passes him out. You thought you won, but suddenly Luffy started to awaken. His hair started to become similar like a cloud, his eyes becoming pink. his clothes becoming white He started laughing and smiling.

HAHAHA! Luffy laughs like a little kid and bounces on the ground like a trampoline as the solid ground turns into rubber his body becomes cartoonish and goofy

"I think I can fight a little bit more!"

"Woah, I feel so funny!" He laughed.

"Yes! this is my peak! HAAHAH!.. Gear 5!"

The battlefield starts to overflow with his powerful haki breaking the ground

He smiles and laughs again