Hey, so I am on the Blindsighted quest for the thieves guild. I saved my game right before killing Mercer to be sure I wasn't sent all the way back to the beginning, so I only have one save along with the three auto-saves in the same location. Every time I kill Mercer, he only drops the right falmer eye with no skeleton key, which is necessary for the completion of the quest. I can't load a different save as all my saves are right before entering the fight. There is also i big ledge preventing me from exiting the cave the same way i came in. I am basically stuck. Is there anything I can do?