Einhorn's fund is now down just 1.1% year to date as value has rebounded.
Panicked executives already have launched a handful of legal battles that could blow up big deals.
Anthony Scaramucci defends the practice, noting many hedge fund employees aren't rich.
His assets have slumped about 75 percent from $38 billion in 2011.
The last time shares of the drugmaker came under this much pressure was due to asbestos concerns back in February.
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