Mr. Blutarsky posted the following messages describing his video.
I’m a construction worker that specializes in rockfall. Aka we make sure the rocks don’t fall on motorists or pedestrians as they go about their commute. Anyways, here’s a rock we scaled in South Lake Tahoe, Nevada side. The area where it landed in the water was where a couple of paddle boarders recently passed. I barely had to nudge this rock before it fell.