This dialogue advances the plot by telling the reader that Paul may have an opportunity to ride Sutcliffe’s horse.
may have a conflict with Mitchell.
will not have the chance to ride Sutcliffe’s horse.
will soon be participating in a race.

will not have a chance to ride Sutcliffe’s horse

teenagers are certainly stereotyped as moody.

most people view teenagers as naturally moody and grumpy, even when this is wrong. many teens are suffering from depression but it is brushed off as "just a phase" or "that's just cause they're a teenager"

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