Located the second point, did the scan, all that happens is four water spouts pop up from the base of the pillar which each give a personalized trick or treat bag, no ghost appears.
I thought it might be because I did them out of order, reading the clues led me to Queensdale after the sewers, only then did I get the clue to go to Lion’s Arch of Old.
That isn’t the case though, there are other players around trying and the same thing happens.
Hats off to all the ones who stood before me, and taught a fool to ride.