What symbolism can be found in Darwin cutting his hair in the novel, When We Were Birds?

Darwin's mother taught him Rastafarian beliefs. After Darwin told his mother he had no choice but to go to work as a grave-digger, he cut off his dreadlocks in the yard of his childhood home. His haircut was a symbol that he was breaking his vows the Rasta took not to cut their hair and not to have any dealings with dead bodies.