Magic,I remember seeing photos of McWilliams doing a similar thing,but thats the first time I`ve seen it in video,also a few years ago I was reading an interview of an ex racer(could have been Rob Mc)and he described how in practice he was passed by Freddie Spencer,both tyres sliding so hard they were both smoking and he was holding it up on his knee until the speed scubbed off and they gripped again!
These people are opperating on a wholey different plain to us mere mortals
