Charles Schwab's Rachel Dashiell turns to technical developments in the S&P 500 (SPX) that is creating a key resistance level for the index. Also mind the bearish divergence, leading what Rachel calls a tentative "false breakout." Beneath the surface, a "stealth correction" shows how market breadth in the S&P and Nasdaq-100 (NDX) soured in recent weeks. Rachel adds that crude oil is experiencing an "inflection point" as key technicals converge.