If you just look at how much volume it took to bring us slowly back from previous $440 to $460 and how very little it took to bring us all the way down again you know the only thing it's going to do is go down for a while.
Thats the thing, it is not so much about volume at this point than the variation in buying/selling prices. It only takes one person selling at a low price to set the trap up. That one person on one exchange will obviously fill that order quickly and that will knock the bar down for future sales. Plus, I have one wallet with around BTC6 in it. If I go on an exchange and drop all that for $350 per coin, then everyone that sees that gets scared and drops theirs for a low price to hurry out of the market. Then, the whole internet gets scared and does the same. The thing is that a good trader will buy those up and then wait a short period for the market to recover and make a killing.