Southern Sabotage bugged

I am horde player and have been playing wintergrasp a lot. I then realized I have a quest I can't turn over because the NPC Tactical Officer Ahbramis seems to be missing. I made a quick google and found that this quest (Southern Sabotage) is an alliance quest.

I know I can just abandon the quest and remove it but it is completed and I find the 10x Stone Keeper's Shard a waste if abandoned. Please help

there is no help.

There is no way for you to turn the quest (you should not even be able to get that quest anyway)