Rick Riordan said this quote
“ The wind god Favonius had warned him in Croatia: If you let your anger rule you … your fate will be even sadder than mine. But how could his fate be anything but sad? Even if he lived through this quest, he would have to leave both camps forever. That was the only way he would find peace. He wished there was another option – a choice that didn’t hurt like the waters of the Phlegethon – but he couldn’t see one. ”