User blog comment:Candy Lover Shopper69/The Heart pirates/@comment-4899461-20121012030246

Law is more serious because he's in a more serious situation. He doesn't have his own Heart, he's rebelling against his former crew, and one of the most powerful members of that crew has shown up with the expressed purpose of killing him. And on top of all that, everything he's been planning hangs in the balance now. Of course he's more serious now!