He often comes in when it is bottoming out and he probably wants it to go lower.
Fact is, the FDA approval is all good news, and the bottom price will not go as low as if the FDA gave conditional approval or non-approval regardless of how much shorts try to scare everyone out. Lots of potential good news and peaks to look forward to, hopefully sooner than later. The stock drop may have been partially caused by lazy investors not learning about the small patient population for MTC until after FDA approval. However, this approval is a necessary step in the process for the FDA approval of prostate cancer treatment.