One Piece Chapter 46, page 17-18: The Uninvited Guest

Just as Patty finishes his warning, Don Krieg, now fully re-energized by the meal, suddenly strikes Sanji with a brutal backhand blow. The impact sends Sanji flying backward across the restaurant floor. Gin screams in horror, "Sanji!" while Luffy, the cooks, and the customers watch in absolute shock at the immediate betrayal.

Gin is devastated and confronts his captain, crying, "D-Don Krieg! This is different from what you promised! I guided you here because you promised not to harm this restaurant! Not only that, that man is our saviour!" In response, Krieg brutally grabs Gin by the head, crushing him as Gin screams in pain. Krieg stands tall, completely restored to his full strength, and says, "Ahh, that was a great meal. I feel like I'm back to my normal self again..." Luffy yells Gin's name in anger. Sanji, wiping blood from his mouth, notes grimly, "So he reveals his fangs at last..." Krieg looks around the Baratie and declares coldly, "Nice restaurant you've got here. I'll take it.