Rachel Dashiell with Charles Schwab turns to the S&P 500 (SPX) breaking below its 20-day SMA and why the sell-off is significant following the index's sharp tech-led rally. In equity movers, Rachel is watching a potential $40 upside move in Ouster (OUST) and eyes W.W. Grainger's (GWW) breakout to new all-time highs.