The fight is interrupted by the Galley-La foremen, who turn on Luffy after Iceberg accuses the Straw Hats of attempted murder.
The episode features a "grudge match" where Luffy discovers Franky is a cyborg capable of breathing fire and shooting from his arms. One Piece Episode 238
If you are looking for the primary narrative features of the episode: The fight is interrupted by the Galley-La foremen,
This glitch likely occurred during the production phase when syncing mouth movements to dialogue layers. Key Plot Features One Piece Episode 238