Step 1 - Take the portal to the Purple Parlor.
Step 2 - Mount onto your flying mount.
Step 3 - Look directly down at the alliance section of dalaran, and fly into the center.
Step 4 - Flying high in the doorway, aim for the tank in the middle of the room.
While up here, guards will not teleport you back outside to the entrance. Have fun /lol at the alliance as they run by confused.
Screen:
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