The lap before, Hawthorn's pit crew had signaled for him to come in the next lap. He had just lapped Levegh (running 6th) after Arnage (one of the corners of the race track) and was determined to keep Fangio at bay as long as possible.
[8] Coming out of the Maison Blanche portion of the course, he rapidly caught
Lance Macklin in his
Austin Healey 100S, who had seen him and moved over to the right to let him pass. Putting another lap on Macklin coming up to the main straight, Hawthorn then raised his hand to indicate he was pitting and pulled across to the right (from Hawthorn's testimony).
What caught Macklin out though was that Hawthorn, using his advanced disc brakes, braked very hard to be able to slow the Jaguar from such a speed in time.
Macklin, who also braked hard, ran off the right-hand edge of the track, throwing up dust. Macklin tried to avoid Hawthorn, whether it was an instinctive swerve from surprise, a loss of control from going onto the change of road-surface, or his car's disc brakes operating unevenly. As a result, Macklin's car veered across to the centre of the track, apparently briefly out of control. This however put him into the path of Levegh's Mercedes-Benz, closing at over 200 km/h (120 mph), intent on doing another lap and in front of Fangio, who was patiently waiting to pass.
Levegh did not have time to react but, with possibly his last action, raised his hand warning Fangio, thereby probably saving Fangio's life.Fangio, with his eyes shut, but with his own quick reflexes, squeezed through the carnage, just brushing Hawthorn's now-stationary Jaguar in the pits, but getting through unscathed.