Trader Brian Jones on Twitter: "To give you an example why I sold my long S&P trade after the opening spike. MDY the Midcap ETF was up .50 and now it's in Freefall down .50. That's a 1% drop from the open." / Twitter

To give you an example why I sold my long S&P trade after the opening spike. MDY the Midcap ETF was up .50 and now it's in Freefall down .50. That's a 1% drop from the open.