I am not sure what to make of the whipsaw action in the ProShares UltraShort Inverted SPY ETF (AMEX: SDS) since Friday morning's surge that tested the Jan-Feb resistance line at 64.20. However, technically, that test failed! Now we find the price structure probing the vicinity of its opposite number: its Jan-Feb support line, now at 60.60, which must contain any forthcoming weakness to avert a potential downside acceleration (that represents a powerful advance in the major equity market ETFs). If the bears were in the drivers seat last Friday morning, they now find themselves on the defensive.