[Dids]

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Also, Charlie's behavior was very weird at the end. Doesn't make sense that he doesn't know where Locke/Eko are, and was acting to Claire as if nothing happened in the hatch.

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Could Charlie be "infected"?

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This was my thought, although in some ways I felt like the whole "infection" thing was kinda deaded in this ep.

I think it's clear that something happened to Charlie. Maybe it's just that he's in shock over seeing the two of the people with whom he was the closest (Locke, Eko) on the island die (at least in his mind). My guess it that it's something bigger.

Although, Charlie's character has been [censored] with all season, and if there was anybody who I think the writers just don't write consistantly it's him. Some of the stuff makes me think less "part of the grand plan" and more "people don't know what they are doing here".