However, Castiel slyly goes into great detail about exactly why he can't help, giving Dean the knowledge necessary to stop Lilith.Although Castiel finds out something and attempts to get this information to Dean, unfortunately Castiel is dragged back to heaven in The Rapture.
Castiel refuses to allow Dean to see Sam, and traps Dean in the Beautiful Room.
Castiel returns later when Dean tries to call Sam, notifying him that he's "outside his service range." When Dean asks Castiel why he came, Castiel attempts to mend fences.
In Lucifer Rising, Zachariah calls on Dean, and he later finds out that the angels don't intend to stop the breaking of the seals.
Castiel is clearly conflicted about the revelation, and is unable to look Dean in the eye.
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