I am short TNA & TQQQ... The short funds to buy on weakness would be TZA, VXX, SRTY, QID & SQQQ. If the markets really drop, the long ETF funds will return a quick profit, so they can be shorted.
You can have a bounce at any point now, but this slide should move down to the major averages 200 DMA....
The NAZ has shown the real weakness, the DOW & SP500 have more % to drop....