In rise we saw the "fear factor" who trigger the coverage and therefore the vicious cicle of increase of prices then more coverage.
Well to the sell part the extended 5th waves thend to be formed as the clearing houses increase the need of colateral
when the price moves in a fast way. This increase of collateral make more traders cut out the positions exacerbating the sell off.
This is my actual take on the gold decline observe how here the fifth wave is almost all the falling and the 5ths keep extending.