The first thing I thought about when he spun was a locked gearbox.Flibster said:Massa's spin was unusual - immediately upon locking his wheels it went sideways. Personally I also would have expected it to go the other way as well *To our right rather than our left*
As he was going in a straight line the slide should have been in a straight line. It's almost as if all the weight was over the front wheels and the rear end went very light, one wheel locked up and that was it. It happened extremely rapidly.
Maybe the wheel(nut) somehow locked the left rear and spun the car, itwas also the wheel they had problems with at his pitstop, maybe that was related to the spin as well.