Hael dragged Cas's inert body to the truck. He needed to stay with her. He would thank her later. After all, it would be dangerous out there with so many angels after him. She would get his permission to share his vessel—a non-human vessel created by God was something special after all—and together they would fix his mess. Together they would figure out how to open Heaven. Together they would oust Metatron. Hael and Castiel against the world. No Winchesters needed.