Underneath the surface of the S&P 500 (SPX) and Nasdaq-100 (NDX) strength, there's a lot of weakness, says @OptionsPlay's Tony Zhang. He explains why the lasting rally across Treasury yields adds to warning signals in equities. That said, Tony points to trading opportunities in stocks and ETFs tied to the yield volatility. He offers example options trades for the Invesco U.S. Dollar Index Bullish Fund (UUP) and Apollo Global Management (APO).