This happens when a number of waves catch up to each other at beach fall and create a stacked effect. When I was body surfing in Hawaii I'd see this happen with two waves, rarely three every day. I think this is four waves which is beyond my experience.
“The sea is emotion incarnate. It loves, hates, and weeps. It defies all attempts to capture it with words and rejects all shackles. No matter what you say about it, there is always that which you can't.” ― Christopher Paolini Movement seen through waves.