Bummer. Was about to PM to see if you might be at Saddleback Sunday in the wake of this week's big dump. Guess not. Ouch. Sorry.
Were you right under the King Pine lift on Haul Back? All those runs over there tend to get a bit bumpy and uneven in my experience. And that pitch at the very bottom is pretty steep to boot. Unlike the lower part of Comp Hill, for example, this is not at all the kind of terrain I imagine myself carving up at a buck ten, unless it had been groomed out a lot more than I've usually seen there. (Admittedly, I'm not a regular.) Possible your edge angles were suddenly exaggerated when your skis passed on the back side of a little bump or roller, and you booted out then?
If not, the confusing thing about your account is that if you were skiing that fast on a 14.5m ski, I'd think your angles would actually be LESS acute than they would be if you were making shorter, tighter, slower turns, and thus less subject to boot out. (If you are really locked in, skiing long shallow turns, as one do often does when going that speed, the only way to achieve such a long radius is to ease up on the angles. I think. Right?) As someone else pointed out, if you lock those puppies on edge at a truly high angle at that kind of speed, you're going to end up with whiplash or be ejected into the sky or some bad combination of both, which apparently is not what happened.
So I guess I'm going with the probability that you were leaning in a bit too much rather than relying more on lower-body angles. When I make this mistake, two things: 1) My edges are more likely to get dislodged by stuff hitting my sidewalls, bindings, and boots (the extreme example being boot-out, but there are lesser degrees), and 2) When #1 happens, I am not in a good position to react gracefully and continue on as if nothing happened - racers are AMAZING at this - but instead just end up on my side, as you described.