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In my copy, Jaime loses his hand on p. 297. The Red Wedding chapter ends on p. 705 and Joffrey's death is p. 830. Those last two, which I think are the MAJOR events in books 3 (that's saying A LOT, since so much happens), are well past the halfway point, so I keep wondering what they're going to finish the season with.
Considering how epic books 4 and 5 are AND the fact that the action in those books (except for the last, what 150+ pages of book 5) runs concurrently, I wonder if they'll just abandon the time table with season 4 and just start in with books 4 and 5 instead of ending the season where book 3 ends. Seems like a smarter plan to me.
I've watched season 2 several times OnDemand in the last few months. I can't wait until HBO decides to run the episodes. I want to watch it when I want!