The overhead 50 day Simple Moving Average @ 1625 has become the 'bugbear' for the benchmark index to get going & put in a serious retest of the highs.
Note the growing # of Indecisive Daily patterns just below.
Absent a 'scaling' of 1625 & more importantly the 61.8% retrace of losses @ 1638.70; then the index (& broader market) remains vulnerable to further losses.