Gravitational forces have taken the index down through two support levels in one go (SMA200/50). This attests to the current weakness, even though we are seeing no panic (yet). Pre-market today, it seems the S&P hovers slightly above its double-bottom support at 2640. I expect that there should be some rebound from there, but who really knows?
If we rebound, the questions will be how far, and for how long? If we break through the double-bottom support at 2640, it will be pretty bad for the bulls, as the bears cheer. Closing below 2640 would be a worst-case scenario.