Clearly that's a joke, or at least, Rosinante takes it as one, and laughs it off. Compliments? Nah, he doesn't deserve them.

"All I did was give you the tools, Law, you're the one who learned to use them," he says. Law could easily have done so many other things with that new life of his, that newfound compassion and strength. He's the one who made the choices, in the end.

"But you're welcome," he teases with a smirk, because he doesn't want this to get too mushy, nor does he want Law to really understand the depths of his self-deprecation.