EDIT:
Merry Derpshidae-mas! (These are the times I love the fandom.)
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It's not just me or the camerawork, right? The SNSD trio portion of this is...rather less energetic than the first perf? It's kind of noticeable since someone as skinny as Yoona really needs to be hitting as hard as possible to be effective dancing, and she just kind of gave up at the end.
On the up side, the Yunho portion isn't boring anymore.