I don't know if I'm understanding well your question, so I will write what was he doing:
He was playing with the waves, because the waves weren't too big. So he decided to go "against" the waves and jump to the sea, like a dolphin...
When I saw what was going to do I went to the sand and took my camera (Zeiss Ikon ZM)... forst time I look at him to know what was going to do exactly, the second time I went to the place I thought he was going to pass... and he told me: "Daddy!! I will jump again! If you are there, I will spalsh your camera!" But I said I was going to be very careful, so he came and jump! And I made the picture. Some time later, when he saw the picture he loved it... today he has said: "When I was jumping like a dolphin!!".