First, I want to say I am really glad you are ok and it sounds like mostly cosmetic damage to your Spyder. That is the best news we could hear.
After reading posts by the few that have come off of the Spyder I'm getting the feeling that maybe the rider was not so much "Thrown", but bailed off. This may be a reflexive action and not necessarily a conscious decision.
I have gotten into this situation as well. In other words, take an on or off ramp in a sudden, unplanned maneuver. Something that you would never attempt on a 2 wheeler. Once I made the initial turn I was committed to the ramp even if it was a bit too much at the speed I was traveling.
Because you can jerk the Spyder steering quickly on a whim without the usual thought process, you can get yourself into a turn that you aren't properly prepared for.
I've gotten a wheel up in a smooth, controlled turn and it isn't all that disturbing. But in a quick, unplanned maneuver it tends to get the rider off balance to the high side which aggravates wheel lift (especially if the rider tries to quickly recover their balance/position on the seat).
The Spyder's great stability, cornering ability, and platform safely gives the rider a "Can Do Anything" feeling. While the Spyder is an incredible vehicle it does have limits.
My feeling is the Spyder will go much further before flipping than is apparent to the seat of the pants meter. This may be the same meter that is causing riders to bail (if I am correct on this one).