I found it much easier to fight him in the hallway close to the previous room and line of sight his AE around the corners. My group is inside the previous room, pull him into the hallway and position him close to the doorway. If he blinks to the group I just hit the follow key and the group comes running over and I hide against the hallway wall. If he blinks to the pally then the pally just runs to the group, hit follow and hide around the corner.

After the AE I pick him up quickly with the pally and reposition the group for the next AE.