One Piece Chapter 672
One Piece Chapter 671 titled "My Name is Kinemon!" begins with the Law getting overpowered by his old friend named Welgo, while at the same time Sanji is trying to get the torso of the samurai back.
Quick Chapter Summary
In the research facility, Law is confronted by the mysterious man, Velgo. Law desperately attempts to fight him, but is instantly defeated. Outside the facility, Caesar Clown has incapacitated the three Straw Hats, Smoker and Tashigi without touching any of them.
At the center lake, Sanji saves the samurai's torso from being eaten by a shark, and successfully escapes from the lake before the surface is completely covered by poison. The reconstructed samurai introduces himself as Kinemon of Foxfire, and destroys the Slime around them with his Foxfire sword style.