Because Balrog would fit in current Durin tower... Oh wait... We have some major plothole/inconsistency in this matter on the server and i am not the only one who complained about this
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I am open for suggestions but there are few points u have to remember:
-teleport zone needs to break vier both going in and out
-going above or under obstacle is an option but only one solution can be chosen per obstacle: for example u cannot go both under and to the right of it (teleport area too wide)
-in my imagination this tunnel should be straight, so semi collapsed part wasthe only thing i could think of. MAYBE goblin barricade/gate done in middle of tunnel could work too but it would need good design
-2 zones for teleportation are required <in and out>, u cannot be able to tell in which world are you standing in any spot in any of these zones