A tire blowing on a newer vehicle such as that will usually not result in the car flipping over. From the description of the scene, more than likely the cars "clipped" causing the scion to flip over. Two of my most recent accidents involving rollovers, where I was the primary investigating officer, were caused by someone turning into the path of another car "clipping" the rear end causing it to flip and the other a small pickup truck pulled in front of a firebird flipping the small ford ranger over. I have yet to see a tire blowing cause a rollover (ie. ford explorer), most just loose control hitting something or are able to safely stop. Not saying it can not happen, but in the numerous accidents I have worked I have not seen a rollover happen because of a tire blowout. I believe a vehicle would have to be at highway speeds (65mph) for a blowout to cause a rollover.