Trading Block: The DJIA briefly slumped more than 1,000 points, its biggest point-drop ever. VIX Cash hit 53.29 at 10am. The VIX jumped as much as 90 percent to 53.29, its highest since January 2009. VIX didn’t update for 30 minutes as options quotes got erratic. AAPL hit a low of $92 before rebounding.

Around the Block: Retail earnings season winds down this week