Bug! stuck in quest "Rumors of the Sulevin Blade"

This quest is found on Cradle of Sulevin. In this quest you need to collect 4 fragments, for each fragments you need to kill a strong enemy, during one of the fights I fell into the hole then the enemy's aggro wore off, I went back up and they are gone, whats left is a quest mark and thats it, I spammed the search button and used vielfire torch, nothing i tried will bring them back.

I restarted the game a few times and its the same, is this a known bug or is there a workaround? Help me please :/

Thank you!