He informs Locke that they will be strangers at their next meeting, and explains that the only way to stop the erratic movements through time is to bring back everyone who has left the island, and to do that Locke will have to die.
He informs Locke that they will be strangers at their next meeting, and thus gives him a compass to get his younger self to trust Locke. He explains that the only way to stop the erratic movements through time is to bring back everyone who has left the island, and to do that Locke will have to die.