I believe this works in the exact same way as the quest for Ronus' boots...you can tell. ;P So I don't think this is a bug, but rather a one-person reward quest, much like the "whoever holds the goblin head holds the boots" thing.
You can probably interpret it as his apathy towards who aided whom or for what purpose, he just wants the proof that another is dead and tosses something towards the one holding. Or something.