I think that the working hours and star pressures pushed a lot of people into drugs in those days. And there seemed to have been a lot of alcoholism.
It is difficult to see the great dance effects as they happen, to see them accurately, catch them fast in memory. It is even more difficult to verbalize them for critical discussion. The particular essence of a performance, its human sweep of articulate rhythm in space and in time has no specific terminology to describe it by.