Marin intends to enter the bridge. It's a procedure she's implemented thousands of times before; leaving Nymet requires using the bridge, and Marin Pathfinder of Nymet could not have survived cooped up in a single innangarð for her entire life. It's not an exaggeration to say that she has spent more of her life in the bridges than in any innangarð. She knows how to operate them: entry, traversal, and exit. It should take a moment's thought to conclude her journey. Instead, as her staff strikes the earth, the bridge opens...somewhere else. She's standing on a bridge- an ordinary bridge, one made from materials and not the raw power of the gods- in an unfamiliar innangarð, with no sign of the bridge she just exited behind her.