I guess now the issue is whether Juliette is a spy and she's still working for Ben coz u know that's what everyone is gonna think except for Jack. But isnt it awesome how she flipped Kate in the opening sequence? Making with the kung-fu; she is not to be taken lightly.
I think it's very important for the Others to keep the rest of the Losties in the dark about their true purpose on the island - they are part of the experiment on the effects of the island on human subjects. Since the Losties know about the location of their camp, it was time to pull up stakes and move to their secondary camp site/back to the Office-Island/to a hatch?
And Smokie! The sonic pillar fence is actually to keep him contained in the experiment portion of the island! Of course, so obvious.
When I saw the Others put on the gas masks I suddenly had this thought: what if there is something in the air - a kind of pollen or something which makes people susceptible to hallucinations, preparing them for the addition of the catalyst (Smokie) which causes some kind of spiritual self-judgement where guilt/anxiety/neuroses surface and are dealt with?
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