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|Trivia_References=
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This episode establisched that every single supernatural entity possessed power of his own kind with the example that [[Castiel]] was truly unaffected if [[Dean Winchester]] hits his heart with [[Ruby's knife]], but was physicall inferior to [[Alastair]] where was injured and almost killed by Castiel with Ruby's knife, but Castiel very narrowly misses his heart and essentially only hits his shoulder.
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The title refers to the medieval question [http://en.wikipedia.org/wiki/How_many_angels_can_stand_on_the_head_of_a_pin%3F How many angels can dance on the head of a pin?]