This is taken from the Lostpedia page on Abaddon

  • Matthew Abaddon was a mysterious agent of Charles Widmore whose job was to get people to "where they needed to be." Chronologically, he was first seen suggesting to John Locke that he take a walkabout in order to find his "purpose in life," an event that ultimately led Locke to the Island aboard Oceanic Flight 815.

So my question is if the hydrogen bomb did indeed sink the island and possibly kill everyone who was still there, then assuming Locke wasn't younger than 21 at the time of his paralysis, who told him to go on the walkabout?

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