Ria stumbles upon a mud bog in the middle of the forest. It's covered in something yellowish-green, like moss and rotting grass. The loose, bottomless, brownish mud sucks Ria down inch by inch as she struggles. Inevitably, she ends up completely below the surface.
In the bonus video, Ria dives, emerges and escapes.
Note: This is a fantasy scene intended to entertain fans of women in peril. Nobody was harmed during the filming of this scene.