Is this considered bug abuse?
Depends.
1. If the player just coincidencely passed the area and at the same time you died, he is not abusing the bug.
2. If the bug can be triggered in a certain way, and that player took part in triggering the bug, it could be a bug abuse, but we don't know if that player actually knew the bug and purposely triggering it or not too.
3. The other scenario is that the player is not triggering the bug, but actually know about the bug and just waiting around there to wait someone die because of the bug then collects the loots. That probably can be considered as bug abuse, but again there is no direct proof that shows if that player knew the bug and abusing it in that way or not too.
So, I can only say without a valid proof showing the player knew and abused the bug, there is nothing we can do.