Desmond looks for a woman who might be the key to helping Faraday stop the island?s unpredictable movements through time; Locke finds out who has been attacking the survivors.
Ryan’s take here.

Um. Fifty years back, fifty years forward. Widmore was a young Other in the past. There’s an H-bomb left in its scaffolding prepared to explode. The first A-bomb was prepped like that.

Preparations for the test included the building of a steel tower that would suspend the bomb one hundred feet above ground.

I’ve forgotten the implication of the nosebleed, but it can’t be good.