CLDX management is known to be extremely conservative. Some investors don't like them because they are thinking too long term. I think there will be no leakage of the dudu to our side. It is likely that SAC bought CLDX on its merits as we investors here have.
I would expect SAC to be experienceing mass withdrawels and as it held 4.9% of CLDX, the SAC related selling pressure is causing the sudden downdraft. Could last a few more days or so, but also may be a good opportunity to add to your position if one is looking for a window.