i tried as well and the boss critted me 4.5k dmg on my tank when shaman ran he got bleed of 1.4k the sham was using resil so it probably a bit less then that
Here is my boss it not on fb yet. it looks completed if I'm still missing anything please let me know http://forum.warspear-online.com/index.php/topic/45752-gabriel-the-cursed/?p=835216