Sure, the retail "investors" are coming back into the "markets"... They are coming back in shifts. And just so they know what to expect, here is what happened to Apple stock in the last second of regular trading today, courtesy of Nanex. Unlike traditional flash crashes where the trade is an HFT error, or a few shares traded through the entire bid or offer stack, in this case it looks like a very premeditated unloading of some 800K shares (some $350 million worth) of AAPL in the last second, with the full knowledge it was shake the market. Why anyone would want (or wait until the very last second) to do that, while covering the offsetting ES short in the pair trade, to ramp the market into the close, is anyone's guess.