Of course there is the possiblility that Jack and Julliet are in this together(Recall the look the two shared on the boat leaving Alcatraz). Perhaps they are both trying to defeat Ben at a critical time.
Ben must need Juliet to do something very important and at a very definate time on the beach with our Losties. It can't be just a mere kidnapping as he could have gotten Micheal to do that for him more or less. I don't think it is to spy either as they don't seem to lack any info about the Losties.
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River Guardian-less
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