First... a little music to set the tone:
[video=youtube;txQYTlZFz-M]http://www.youtube.com/watch?v=txQYTlZFz-M[/video]
We all know Sasuke is still on the path of destruction. That much has been shown and confirmed in this chapter.
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Indeed - Sakura is happy to see her team re-united, and does trust Sasuke... But she remembers:
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But... She's not standing on the sidelines, anymore:
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And... she knows what will happen if Sasuke continues down the path of destruction:
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This has already happened once, with Sasuke's refusal to obtain power the same way as Itachi being the only reason Naruto survived.
And we've been here, before:
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Every now and again - a Cherry tree blossoms.
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Its blossoms grace our presence.
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And then it fades.
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The wind that changes Sasuke will be the same wind that blows the Sakura from the trees.
Shikamaru noticed it - the look Sakura got in her eye before doing something 'rash.'
In her final moment - Sakura will bear the burden meant for Naruto and Sasuke, so that their fate may be changed.
Edit: Quick edit to title.