John Carter of Simpler Options reviews multiple markets and asset classes for clues into yesterday's sell off. the NDX took out lows and a big squeeze has set up. At this point, as long as bonds are strong, the market will be under pressure. The U.S. Dollar continues to trend higher. Key stocks he looks at include AAPL, INSY, PCLN, GPRO, KO FSLR. INSY and GPRO outperformed in particular for some nice short-term trades. Finally, Carter is looking to get more aggressive with buying puts and selling calls, the catalyst to that is the move in the dollar.