In case anyone is having this issue or is keeping up with this thread, I had this issue and found a solution.
I reloaded a previous save. Mine was directly after entering the third trial before jumping into the water and fighting the ghosts. After the cutscene with Sapadal, and the elevator rising to the top, I ran out of the ruins. Once out of the ruins I killed everything in the area before heading up to the quest. This included everything under the walkway heading up to the quest. Once done, i let the two finish their bickering and spoke to them. Everything played out as it should have including the scene with Looders which didnt happen before.
I am not sure if killing everyone and letting them bicker is necessary, but I figured eliminating all possible issues would be best and it seemed to have worked. But entirely possible that just loading the closest save works too.
Hope this works for others.
