Born blind he had no choice to leave his family for his sake as well as theirs.
Unable to do nothing while they did everything so he could live a happy life, he detested himself.
He despised being weak.
He hated being helpless while his loved ones did everything for him.
He hated fate for making him blind.
He despised himself for not doing anything despite getting numerous chances to do so.
So he took this last chance to fly in the limitless cobalt skies.