Marena and her circle- Misho, Secret, Ten Winds and Karen-- are running away from the Sidereal hot on their heels, after the Keys. Misho casts Stormwind Rider, and they're widening the gap--
And then one of the Sidereals casts something.
Marena loses all of her forward momentum, and lands flat on her face. She also loses her friends. If they're around, she can't see them.
The Essence here is different, unlike anywhere in Creation she's been. ...which implies that she might not be in Creation? That's not good.