Killed the arbiter of ash, but I died as he died.

Killed the arbiter of ash, but I died as he died. Now the fight is done, but I cant reach the object that fell. This is so frustrating, this was my first try at him as well. Cant reach it due to the blockages respawning on each side as if I was restarting the fight.

I've got the same issue, did you find a solution?