Ok they dont get credit for the of the night fall the other drakes enrange and kill the hole raid you still have to kill them all for the achievment he got when the volcano blows thats it...
Schaun
Drake farming in t8 imo :)
They probably already had 3d achievement kill thats why he didnt get it.
If you read the chat log people did get Twilight zone on the kill, just the guy that made the video already had it.