"I know who you are, Ms. Swan and you know who I am as well." The purple suited man waved his hand and summoned, with a puff of yellow smoke, a cane. The man stood tall before the Dark One and chuckled, "and you know who I am. Or at least you should. I'm the Warden of Superjail! I monitor every criminal throughout every dimension including this dull one that I was dragged to."
Emma Swan studied the enthusiastic man as he spoke, in every liberal term he managed to conjure up an object or transform into something himself but then would return to his normal form. She raised a brow and asked "then why are you here, Warden? Surely you should know why you were brought here. Stop stalling and speak up."
The Warden managed a smile, the Dark One's dagger appeared in his gloved hand. Emma hadn't sensed it's disappearance but now she felt that something important was torn from her; her free will. The Warden studied the weapon then focused his attention back to Emma. "One of my jobs being the Warden is not just to monitor criminals but to also monitor the Dark One and prevent it from causing some form of apocalyptic event. If the Dark One commits some form of major atrocity then he or she will be sent to Superjail which to you will be SuperHell."
The dagger vanished from the Warden's hand and reappeared in front of Emma's feet.
"Now Ms. Swan, you are different. I know and sense you are different from Zozo, Rumplestiltskin and my former nemesis; Stingray who was a Dark One at one point. You saved Storybooke several times once upon a time ago so...you're sentence has been reduced by a few hundred years. So don't screw up!" The Warden turned into a screw then back. "And most of all, don't take the Excalibur because when you do then we'll possibly see each other really soon. Ta-ta!"
The Warden faded away from the Dark One's presence, he was no longer in this land without magic. Emma Swan picked up her dagger and left the forest as if nothing happened but now she knew that she was being watched.