That happened before at another Park. The Woman on that ride literally popped out of the seat. She had short legs and a very large torso. The restraint bar was too low for her body.
Almost like squeezing a water balloon from the bottom. It pops out of your hand.
To confirm what I had said earlier, she was a larger woman (https://twitter.com/jobinpnews/status/358682004566462464/photo/1). I have been to parks where the ride operators try all they can to fit larger guests on the rides, the take away from this incident might be that ride operators will be trained to kick off larger guests who do not easily fit into the restraints.