You try to open the door, but it won't budge. You look back at the inside of the door and find there's a lock, just like your door... on the inside.
"Wake up!" you yell as you bang on the door. "Wake up!"
The thing is trying its hardest to reach the girl, but the chains are pulled taut. It starts to groan. It sounds almost hollow, but it's unmistakably sorrowful.
The girl starts to stir, and you resume banging with all your might. "Wake up! Get out of there!"
The girl, barely coherent, stares at you blankly for a moment. She blinks several times, then the thing begins to moan again. Her stare snaps to it as she jumps up and presses herself flat against the wall.
"Jonathan!" She wails.
"Get out of there!" you yell again. She inches her way to the door, carefully avoiding the zombies reach.