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With the new Ogrewatch Cut tower in Eternal Battlegrounds,
when the wall is down on the tower, it is posssible to teleport from the plateau below the lords room ramp up to the ramp (Sand Swell, Shadowstep etc.)
As no other tower/keep functions this way in WvW, I believe it is a bug that needs to be fixed.
So far through testing, it can only be done while the tower wall is down. Have not tried the gate.