Volatility...

VXX was picking up on it, check out this volatility and this is not closing volume, this is about 3:56

 You don't see the price volatility in BAC because I'm almost 100% positive it is sitting right at the VWAP (which is where market makers/specialists fill orders), but look at the red volume to the right, almost panicky.

 The IWM which has been mellow all day sitting at about a +.20% gain just saw volatility pick up on heavier volume.

 Look at the chop in the SPY and some of those 1 min price candles, plus the volume and as I said, this isn't end of the day settlement volume spikes, this was at 3:56.

And the TICK went from +1250 to -800  with +1000 to -800 readings in 3 minutes.

The market looked a little panicky or rushed toward the close.