Sora got the hint that Riku wanted to be alone. However, he wasn't going to let Riku go off and sulk by himself anymore. The other boy was stubborn -- beyond stubborn. Luckily for Sora, he was just as stubborn himself, and not afraid to irritate Riku. He wanted his friend to be happy, or as happy as he could be, and if he had to harass Riku until it happened, then he'd do just that.
"Disagreement. With who? Leon?" he asked with a frown, and no small amount of surprise in his voice. He didn't like Riku's flat tone; it set of warning bells in the back of his head. No, he definitely wasn't going to let Riku go. "Can't you just talk to me for once, Riku, instead of running off?" Sora sighed. It was a good thing he had gotten used to running around so much, or he wouldn't have been able to keep up with the older boys pace.
"R-Riku. I'm worried about you!" There was no small amount of alarm in his voice now. He didn't know what else to say. Sora figured it would probably be a stupid idea to try to physically stop him; he didn't want to risk a fight, and it seemed like Riku was in the mood to lash out at anyone, even him. The truth was, he was worried. Really worried.