To whom it may concern,
I ran into a freeze bug that nearly made my saved game a total loss during Fable II - The Bargain - chose save and continue during the troll fight, then after loading and resuming the battle, the crashed and the entire machine froze (could not access dashboard) if I my character was knocked prone after that. I'm assuming something about the animation of getting knocked prone was causing the problem, because that was the common bond between crash instances. I powered down and tried to reload, and then repeated that process a number of times, varying other factors - eventually after choosing to save and continue in two other areas, then returning to the area with the troll, the bug stopped occurring.