Your thesis would undoubtedly find support on certain message boards; however, I don’t believe Big Pharma engage in Machiavellian schemes to drive down the share prices of companies they would like to acquire.
The FDA issues news releases at all times of day with no regard whatsoever for the stock market, so the timing of yesterday’s V-Pak release was not unusual in any way.
After I saw the news I wondered if someone with more DD could have suspected. Not that I would have thought to look especially since I sold my ENTA position some time ago (far from the peak I'm not that smart :-)). But a poster who used to post infrequently here (thebusyant) had started a website to track the public FDA AE's database (in a more readable/searchable form). I didn't pay but in the free (limited results) there are clearly liver tox AE's and one death would be interesting if in a full search it would be more evident.