Quest: Invasion Point: Cataclysm

Hi! Im trying to complete this quest in Shadowmoon valley but when i get to the location where Nakansi should be its empty.. no NPCs at all

Besides, the following quests:

The Art of Fel Reaver Maintenance

The Fel and the Furious

And News of Victory can not be completed.

Since this quest is pretty fun and reward is very very good for hybrid classes like paladin and shaman. Please fix this quest for us. Thanks very much!

Notes:

1. the documents for the quests chain is: https://www.wow-one.com/database/?quest=10767

2. the document of wowhead: http://www.wowhead.com/quest=10767/invasion-point-cataclysm

3. the document of wowwiki: http://wowwiki.wikia.com/Quest:Invasion_Point:_Cataclysm_(Horde)

4. there is a NPC in the quest to finish this quest and give the following ones. I think the most difficult is the second last quest. We need to control a Fel Reaver Sentinel to destory Deathforged Infernals. IF its too difficult to fix this. Could you help us to simplify this quest so that we can skip the second last quest to complete the whole quest chain. Thanks a lot for your hard working.