It sounded like he was pulling the tarp off the buggy.
A soft-sided pool is usually put together using PVC plastic pipes, a pool liner with sand and a tarp placed beneath the pool before installation.
Along a similar line, wet newspapers laid down over an area, or even a tarp or black plastic will kill grass beneath it.
Take the blinds outside and place them on top of a plastic tarp, making sure they are fully extended with the slats closed.
She pulled a handful of hay from under the tarp and fed it to the horse.