Some mobs jump up a floor when pulled
 

In 2 places I have noticed mobs teleport up a level when pulled with shaman dots with nuke component.

1 Sol A the 2 goblins past the portcullis can teleport to the floor above and then path back down with a train.

2 City of Mist in the 2nd floor tunnel on the right if looking from the direction of zone-in, the mobs can teleport onto the roof of the tunnel and then attack you from up there without the ability to fight back at them.

Working as intended moved to resolved