In Iron Man2, when Ivan wears the plasma arc weapons and wanders onto the Grand Prix and starts slicing apart the F1 race cars. If you pay close attention to where the plasma arc cuts into the body of the F1 cars, the diagonal cut would have sliced off Tony's legs along with cutting his race car in half. The way most of the drivers would have sat in an F1 car would have placed their legs in the front nose of the car simply because of space constraint. Tony would have come out out of that crash with bloody stumps for legs instead of emerging unscathed.