NDX100: Signs of the elusive Medium- Term High?

NDX100 Daily Chart @ Close 09/12/2016

Whilst the Benchmark S&P500 gave it's Sell Signal pre- NFP's; the NDX100 gave both a nuanced Daily Indecisive Sign & then an overt Key Reversal Weekly Chart (Small Caps as well) last week.
Largest 2 Day move since the early 2016 'scare' Jan/ Feb leaves as many Q's as A's post FED commentary that exhibits divergent FOMC Policy views?
Should the overdue Correction play out; Support @ 38%/ 62% retrace of Rally > 4180 resides some distance away from Monday's Close.