Sitting in that spray of water is a small water wheel connected to a power generator. Power conduits leading from that small generator are tacked to the rock, and lead through a small opening in the wall.
I know this is grasping at straws, but could a well-placed blaster shot cut some of the conduits and drop them on the path, or in the water near the path? While the power generator is still feeding juice to them, or course.