I obviously missed the patch notes that tanks now have only 5 sec (or less) to taunt the other boss in order to stay alive. And even if they both taunted within that timeframe there is a chance that both tanks die to a 120k+ dmg hit as if they never had taunted the other boss.
Blocking conduit strikes seem to be broken as well as you get stunned while blocking, or is this just a further exploit-fix and hence not documented anywhere? While the boss remains killable I don't know why this change was necessary but please, ZOS, try to enlighten me as my patience with your update/fix/bug strategy is diminishing faster and faster ...