Just watched this episode. Great Television!!!
Anyone think that this is related to the sickness that was discussed in previous seasons. We didn't know too much about it other than it was it caused fever, delerium, then death. Those symptoms seem to match the experience of the time travelers. W/out a physicist to explain things to you, an observer might just assume they had caught some kind of virus and were randomly ranting.
It also clearly takes some combination of things to time travel based on Daniel's comment about being exposed to radiation or electromagnetism recently. Explains how some people could go to the island without catching the sickness, while others would.
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