Assertion: pony's tail | /r/HasAspect | natural flowing motion
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Source sentences:
text: Her tail and mane have a natural flowing motion, even when Celestia herself is not moving, but they stop doing so when Celestia is weak, as in A Canterlot Wedding - Part 2, unconscious, as in Princess Twilight Sparkle - Part 2, magic-less, as in Twilight's Kingdom - Part 2 and The Ending of the End - Part 1 and Part 2, or covered in slime, as in Make New Friends but Keep Discord.