- Desmond is not killed by electromagnetism.
- Widmore is looking for electromagnetic anomalies on the island using a Dharma-map (that's why they kidnapped Jin).
- We've now seen the weird light-cave that is the "heart" of the island and which turned Jacob's twin into Smokey.
Also interesting is a quote from Pellegrino, aka Jacob, that was in TV-Guide:
TVGuide.com: Why can Jacob leave the island, as he's done to visit his candidates, but the Man in Black cannot?Chained? Is that why we hear a mechanical, "chain-rattling" sound when Smokey moves? And could someone break the chain? "Nice to see you out of those chains" is what Smokey told Alpert after all...
Pellegrino: This is a question that I've wondered about myself actually. I don't think the answer is directly provided in any episode, but it could be the fact that I'm a guardian of sorts and therefore have a certain power to exit when I want to. He can leave as long as it's directly for a certain purpose. After I threw the Man in Black in the pit, he's chained there. He's become incorporeal, and he's in something worse than hell.
Yes, my brain is imploding. Why do you ask?