Sora stopped walking abruptly and stared at his phone. He breached a level of confusion that he didn't usually tap into. Before the panic set in, he went to check that he had sent that text to Riku's number.
He did. So he started walking, fast. Panic started going up, up. 'Who is THIS? Why do you have Riku's phone?' Did his phone get stolen? What happened? Was Riku just being a jerk? He knew better than to worry Sora like that, especially right now.