One Piece: Season 1, Episode 915

1 - 915: Destructive! One Shot, One Kill - Thunder Bagua!

An infuriated Luffy strikes blow after blow on the drunken Kaido. When he activates Gear Four Bounce-Man and launches even more powerful attacks, Kaido fights back and knocks him out with just one blow. Law tries to rescue Luffy but is interrupted by Hawkins and now Kaido approaches Luffy, unconscious on the ground.