I would think the floor raising and/or other ride elements would be locked out by the ride's computer if it senses the ride is in motion, similar to roller coaster blocking. If the computer in fact allowed the floor to be raised while the ride was in motion then that would be a program error I would think. Also if the floor was raised, why didn't the other cars fall off as the ride looked like it was at it's full height swing, on the way back (after the first one broke off), the other cars would hit the floor as well, or people on the other cars feeling their legs hit the floor, so far we haven't heard about any injuries in the other 5 (?) cars and from the aftermath video, they all seem to be running off the ride with no injuries, so I would be more inclined to believe the metal fatigue story than the floors raising story.