Keep in mind there are many millions of "golden tickets" out there in the form of warrants to purchase shares at 2.60 through Oct 2012. There are many millions more to buy at 2.40 through early 2016. Of course, there are also many millions in call options (25 million shares represented by ONLY the Jan 2014 open interest). So, many of those short or shorting can be short against warrants or options that they hold, not having to cover in the market. They can simply exercise warrants/options to deliver against the short.