Larry, you could make a case for a 50% re-trace off the high of the engulfing candle, but the odds are not good for any more than that.
With NDX 1002 a very key level, a 50% re-trace to there would put a low at possibly NDX 980 tomorrow AM. That's also a test of the 1300 COMP low from last Thursday. We'll see if that happens.
Otherwise, a .382 re-trace to 1002 would put a low around NDX 966 (doubtful).