Westley dives into lightning sand with vine to save Buttercup.
Snow sand is one of the three terrors of fire swamps.
It is a drier and quicker form of quicksand. Buttercup unwittingly steps in some and is immediately immersed in it. Westley hacks a vine off of a nearby tree and dives in after her so he can pull them both out.
Notes[]
In the book it is called snow sand. The "lightning sand" moniker is said in the book to be a misidentification, as lightning sand is supposedly quick and moist, with snow sand being quick and dry.