I would like to remind that the necropsy report on Eight Belles was public, and there was no indication of pre-existing bone damage (I think we\'ve talked about that before).
Both legs didn\'t break at once. The second was a consequence of the first, on a tired horse at the end of a race. That timing really does matter.
Her muscle exhaustion mattered alot as to why two legs were affected (muscles thus tendons stretch when fatigued, can\'t hold the boney column as tightly together, etc)
When was the last time you ever saw a horse break after the race was over? That could not have been more odd.
That is exactly the type of horse that normally would have made it to a walk, then been sore or lame cooling out or the next day. We see thousands of those.
Unfortunately for EB the first leg gave out about 5-10 seconds too soon, and the cascade of what followed resulted in her death.