Or Just An Animation Error

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Or Just An Animation Error
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It was stated a few months ago that Pinkie's sisters would appear in an episode in season 4, so we'll find out soon

Analyze Away, Bronies

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Analyze Away, Bronies
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So if Luna is the element of loyalty then why did she turn against Princess Celestia? Unless Luna's loyalty is to her moon and her night time and she felt that Celestia had betrayed her first by trying to outshine her. Or should we be more concerned that Luna is the element of laughter?