From how I saw it, it was basically Ryan's character putting the people on the bridge into a story in his head before he died and the story he imagined was basically a really twisted, convoluted semi-truth of what was going on in reality (Ewan's character trying to save him, the little boy asking about whether he was going to die, the blaming himself for the death of his parents and girlfriend, etc.). Or something like that.
It was definitely a bit of a mess, plot-wise, but Ryan and colors were, again, terrific.