Price action in commodities usually have a regression to the mean after spending an extended period of time at extremes. Trading greater than 2 standard deviations above the 20 week SMA for five consecutive weeks is trading at an extreme. While there was a relaxation of that extreme the week before last, the market was due for a regression at some juncture. Last week, the regression took prices back to the 200 day SMA, the 40 week and the 20 week SMA before finding support.
Currently, the market remains within the extremes from the August price behavior. With all of the moving averages poised in a tight range (a nickel range) just below, an additional break down like last week seems unlikely.