These nut jobs expend their shares at a cheaper price in order to drop the share price down then re-cover at the lower price.
This will work to a point as long as there are enough shares available to buy otherwise they have to let it rise again until more shares to become available. So if no one is selling, this will climb back up again. HF's played the same game with DNDN at the time and eventually went bankrupt when Dendreon got FDA approval for Provenge.
Hold on to your shares and don't fall prey to these thieves. Remove any stop losses otherwise they will steal your shares. Btw...HF's pay dirtbags like Adam F and Jim Cramer to write negative articles to help their cause. Someday I would like to see both of these guys behind bars.