Twenty-nine years ago Alain Prost and Ayrton Senna stood together on the podium at the Australian GP, the final race of the season and embraced one another, the rivalry that defined the sport, it seemed, thawing just for a moment. But that moment, which took place on November 7, 1993 was historic for another reason – which none of us watching knew at the time. As it turned out it would be the last time that either Prost or Senna would stand on the podium.