Unit 1 and Unit 2 were traveling on Lake Moultrie near Overton. Unit 1 was going in circles around Unit 2 jumping the boats wake. Unit 1 came to close to Unit 2 several times. Unit 1 hit a wake and threw the driver,  into the water and the path of Unit 2. Unit 2 struck operator1. Operator of Unit 2 noticed what happened and picked up operator1 and took him to shore for medical help.