Actually, I am well aware of the 1955 LeMans accident. This was a very unfortunate set of circumstances, the combination of the fuel tank erupting, very thin magnesium bodywork and attempts to douse the flames with water. If you review the footoage, I think you will find that is a standard fire until the safety workers try to douse it water. This is a big no-no with magnesium. Only then is there any evidence of the magnesium actually reacting and burning.