Posing as a hospital orderly, Abaddon met John Locke (http://lostpedia.wikia.com/wiki/John_Locke) at the rehabilitation center after his fall from a window caused by Anthony Cooper (http://lostpedia.wikia.com/wiki/Anthony_Cooper). While wheeling Locke back to his room, he stopped, and urged Locke to attend a walkabout (http://lostpedia.wikia.com/wiki/Walkabout), something Abaddon claimed to experience that changed his life. He even claimed to have experienced a miracle (http://lostpedia.wikia.com/wiki/Miracle). Abaddon told Locke that if he did the walkabout that when they met again, he would owe him one.
Without this meeting, why would Locke go on the walkabout in the alt-timeline?

Without this meeting, why would Locke go on the walkabout in the alt-timeline?

To prove something to himself. In the main timeline it was obviously a push from one faction on the Island or another. Locke, however, isn't so different in the new timeline that he wouldn't try to get on the walkabout.

Course correction. That's the whole idea. With or without certain influences in life, there are certain things that are just meant to happen to us. Obviously he didn't get pushed out a window by his father, either, and he didn't meet Helen in group therapy. But he's still paraplegic, and he still met her.

Course correction. That's the whole idea. With or without certain influences in life, there are certain things that are just meant to happen to us. Obviously he didn't get pushed out a window by his father, either, and he didn't meet Helen in group therapy. But he's still paraplegic, and he still met her.

Agree. Almost forgot who Abaddon was o_O