But the real casualty on the day was the NYSE.
With such comprehensive damage it is looking more and more likely the Dow and S&P will follow suit down past July lows. Given the relative position of breadth indicators (neutral to overbought) there is room to see this evolve into a more substantial decline with the possibility of a bear trap relatively slim.
I don't know if Russell 2000 support will be enough to save the market (August 25th comments still valid today):
Dr. Declan Fallon, Senior Market Technician, Zignals.com the free stock alerts, market alerts and stock charts website