1x03 dead in the water

All Along the Watchtower - 12x23 (and 12x22) and Circular Narrative Structure

An entity with yellow eyes enters a nursery:

1x01(Azaezel Prince of Hell over Sam’s crib)

and 12x23 (Jack the Nephilim, son of Lucifer and Kelly)

A woman dies in a nursery:

1x01 (Mary Winchester burns on the ceiling)

and 12x23 (Kelly Kline dies in a blaze of light giving birth to Jack)

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