Investors who were smart enough to read the IPR and put together the Worlds continuation patents 7,8 and 9 filing dates would quickly realize the Examiners had full knowledge of what ATVI's clone (Bungie) prior art reference argued what was not considered. Separately Judge Caspar ruled on most of the same terms contained in the IPR in favor of Worlds. Worlds responds to the PTAB in August.
This volume is more than likely smaller shareholders selling out of fear in re; Bungie v. Worlds; recent filing related to patent challenge before the United States Patent and Trade Office Appeal Board. Worlds has not filed a response to this matter though I think they will shortly.