That isn't all that impressive, you can clear in that time with a standard DD pt or BSTs. There are few mobs in there that will resist dark and increase the clear time by a lot, compared to BST or DD which don't have to worry about that. Also there are now more magic resistant mobs in Escha which BST can just laugh at, you are really trying to grasp at straws in here bringing stuff like that up. The damage was already done, SE already looking into BST just stop wasting your time.