I'm not sure. Do you mean in a sort of "And Cas is evil now the end" kinda way? Because I thought it was a wonderfully slow build up (I started bouncing excitably about possible evil!Cas from at least 6.17 onwards (and possibly earlier; I know it was at least then because it's in my episode reviews for 6.17)). I can see what you mean about the actual end of 6.22 seeming fast, but for me that made sense to leave evil!Cas directly ready for season 7 without starting to explore him as a character in the last bits of season 6.
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I'm not sure. Do you mean in a sort of "And Cas is evil now the end" kinda way? Because I thought it was a wonderfully slow build up (I started bouncing excitably about possible evil!Cas from at least 6.17 onwards (and possibly earlier; I know it was at least then because it's in my episode reviews for 6.17)). I can see what you mean about the actual end of 6.22 seeming fast, but for me that made sense to leave evil!Cas directly ready for season 7 without starting to explore him as a character in the last bits of season 6.
Or did you mean something different?