The S&P 500 found multiple times support on the 50-day MA period and is likely to find that again. I expect on Monday the sell off to continue till 4430-4420 levels and will be looking to enter a buy. 50-Day Ma is key support but price will also find support on the 0.618 fib retracement and previous S/R level. The FED is not going to change policies any time soon...
