A man is pulled behind a boat on a knee board while another doing the same begins to fall .
We believe that there are two males on knee boards being pulled behind a boat , one is an expert and the other is a novice .
We doubt that there are two males on knee boards being pulled behind a boat , one is an expert and the other is a novice .
We believe that there are two males on knee boards being pulled behind a boat , one is an expert and the other is a novice .
There are two males on knee boards being pulled behind a boat , one is an expert and the other is a novice .