Stopped out of NYX

I got stopped out of NYX this morning when it broke through its 20-day moving average. The market feels like its rolling over again. We had a huge intraday reversal yesterday when we failed to break through the 200 day MA on the S&P. I got put on a short MA(Mastercard) position yesterday right before close. I still like NYX prospects but if the market rolls over right now its taking NYX down with it.