nope had simular issues too. knocked him off, all of us went out of combat and then he was back at full health. also i have yet to see any of his abilities cast other than the vengence one which he does only while he attacks you one at a time. the one that needs to be interrupted i cant see as a range dps. atleast this last time i couldnt see it nor anything else.
i just dont understand why bioware wants to wait for 1.2 to put in place fixes that are ready and should have be done months ago. if it is fixed update it now. if you dont have the resources to do this something is terribly wrong and deserve the critizism you are getting.
I've had this happen like once out of eight or nine times I've done FE. He popped right back up so we knocked him right back done. No sweat.