The stock market sold off hard in the morning on Monday likely due to end of the year rebalancing activities, but the Fed was there to support the market by injecting massive liquidity into the banking system.
The market rallied really sharply back up. This type of activities is likely to continue into the year end as fund continue to rebalance, and the Fed will continue to stand by to support the market. As for NQ, as long as it continues to trade above 12,400, buying the dip should still works.
Trading below 12,400 could change the trade bias from bullish to bearish.