These were celestial medics who performed mercy killings on mortally wounded angels on the battlefield. On Earth, this angel has begun "mercy killing" humans who are experiencing even minor emotional distress.
The visual effects of the Rit Zien's kills became a memorable, albeit gruesome, highlight of the season.
The Rit Zien’s presence suggests that human suffering is so profound that even a celestial being can no longer distinguish between temporary sadness and a terminal soul-wound. [S9E6] Heaven Can't Wait
Castiel’s journey highlights the dignity found in "lowly" work. His pride as a former Seraphim is replaced by a genuine desire to be a "good" human.
Dean investigates a case in Rexburg, Idaho, where people are seemingly exploding into pink mist. He discovers that a "Ritual Man" (a Rit Zien angel) is responsible. These were celestial medics who performed mercy killings
Heaven Can’t Wait is the sixth episode of the ninth season of the long-running dark fantasy series Supernatural . First aired on November 12, 2013, the episode marks a significant tonal shift for the character Castiel as he navigates the mundane complexities of human life while a new celestial threat emerges on Earth. Plot Synopsis
The narrative follows two parallel storylines: Castiel’s struggle with humanity and Dean’s investigation into a series of mysterious disappearances. The Rit Zien’s presence suggests that human suffering
While Sam remains at the bunker (secretly being healed by the angel Gadreel), Dean is forced to lie to both Sam and Castiel, deepening the wedge of secrecy between the protagonists. Critical Reception