What cause-effect relationship does the author identify in the section "Moving On from Childhood"? How does this information relate to the author's main message?

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As the boys sleep, military airplanes battle fiercely above the island. none of the boys sees the explosions and flashes in the clouds because the twins sam and eric, who were supposed to watch the signal fire, have fallen asleep. during the battle, a parachutist drifts down from the sky onto the island, dead.