Well, thats how i solve
First u jus go do the quest then when u r facing him jus click exist button from ur robot things ,( theres exist button )
Then u will fall down ( if u r druid or dh, or some class which cant die then u r ok)
If so revive n go back to quest
Abandon quest and relog
Then take quest, back then do again
It should work
I tried 3 times that way