"Because it happened to your sister"

In LA X Part 2, Dogen felt it necessary to ask our Losties the question "who are you", yet in 'What Kate Does', Dogen tells Jack that the darkness happened to his sister.

My question is, how does he know this darkness deal happened to Jacks sister (Claire), if just a few minutes ago he didn't know who Jack or the rest of the Losties were.

P.S. That was the worst episode ever and this whole season is looking like an epic failure.

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