Darius has made it clear to readers that he’s not normally the kind of person to easily agree to something like playing soccer with boys he doesn’t really know—that’s a situation ripe for embarrassment and possible bullying. But Sohrab makes Darius feel secure and as though he can try new things, and so Darius begins to step out of his shell. He also gets a reminder that some people in Iran will expect him to taarof, so Darius will need to adjust to differing cultural norms.