Thats where we got stuck, killed the Mursatt at the front door but the Ether Seals kept getting us (this was after we opened front door, seals on each side just on the inside of entrance), amazing where 1 person drops out how much difference it makes.
Where abouts is the Eidolon on this mission, one of the group said towards the end of the mission, but I ave no idea, think the 2nd infusion would be a great help.