"By the time the pile was built, they were on different sides of a high barrier."

This talks about how Jacks try's to take power away from Ralph but Ralph shows that everyone still thinks as him as chief and is above everyone else. Jack doesn't even ask Ralph to move from the usual fire making place so they have to make the fire somewhere more inconvenient. Even with no words Ralph asserts his dominance and power he still holds (page 73)