Waiting for the tide to come in

It was low tide when we first got to the beach but a few hours later things had changed dramatically. As the tide began overtaking the shore line, we noticed a  rock that looked like a potato, that was still a foot or more from the nearest encroaching wave. We decided to watch that rock until the tide reached it.

Oh the suspense, as the waves crashed nearer and nearer! Finally the rock was splashed! Next, the rock was momentarily submerged, by the relentless waves that surged in, then rolled back out. At long last, the rock was submerged for good, completely covered by the tide, reclaimed to the sea.