Tried to do the level 70 "Tower Down" story quest today. First time, got all the towers down, got the braces cleared indication. However, Tonn gave his speech but I was unable to talk to him. Quest failed. There were a few Risen around but killing them did nothing. Second time, focused on killing all Risen in each area. But party got ahead of me and Tonn stayed by me and when I ran back to the party, Tonn stayed at first beach area. Eventually he showed up at second beach area, but would not bow up the tower. Quest failed. Third time, essentially repeat of second. Fourth time, kept the party together, but ended up with repeat of first. Very frustrating.