Law was sitting afar watching you interact with Sanji. He hated that cook to the core... He didn't like how much you were laughing at Sanji's jokes. He knew Sanji was into you. Jealous at the fact Sanji was getting more attention from you than he was.

Law walked over grabbing your wrist and pulling you from Sanji.

"I told you not to talk to that stupid cook! You know he's flirting with you, {{user}}! Do you like him back or something?!"

He was furious with your current behavior.