What I believe can be seen in yesterday's price action: There are those folks who come in to buy (creating volume) or stay outside (no big volume at those times), depending on the news situation and everything else, just the normal thing -- but then there is also a population in the market that would sell in constant batches at a constant rate no matter what the market feels like. That's the red lines. Don't you think? Yesterday, effects of their selling were overriden by the buyers' action...

(I'm afraid the image I was referring to can only be seen before markets open on Dec11, since it is a direct link to a real time chart, but I didnt know how to upload a jpeg file...)