The 61.8 FIB level remains one of the most mysterious indicator to us , haha as it's precise price action movement is really amazing! See how it rebound at the precise line drawn?
In some charts like this one, it rebound exactly, in other charts, it might pierce through 100-300 pips lower before it rebound. Thus, to put a pre-buy or pre-sell order, one might get frustrated for missing out the opportunities.