Short covering rallies are ALWAYS on low volume because very few people play the short side of the market. If you were awake for this mornings action, you will notice there was nor follow through rally and the market is now on its way back down to test support again. The smart brave BEARS who covered low yesterday, no doubt sold again at the close and turned it into a day trade remaining short for those lower prices to come. You should read John Murphy's book on Technical Analysis. John is the modern day authority and a lot of people trade according to that book which, in fact, causes the markets to move the way they do.
Long term, this stock still has potential for the long term but for now, it's going lower looking for price support. Most of the smart longs have taken profits and they want to buy back in a much lower price.
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