RedactedNarrative: On May 31, 2014 at approximately 1:30 PM two jet skis operated by Operator1 and Operator2 were operating along Lake Carroll approximately 1/2 mile east of the west marina. Vessel 2 noticed vessel 1 had fallen behind. Vessel 2 stopped and was idling waiting for vessel 1 to catch up. As vessel 2 was idling, vessel 1 came up at approximatey 20-25 MPH in an attempt to splash vessel 2. Vessel 1 let off the throttle causing loss of steering. As a result, vessel 1 collided with vessel 2 causing Operator2 to be thrown from his vessel. Operator2 was able to climb back on his jet ski. Operator2 was taken to the hospital by a parent of his friend who he was visiting at Lake Carroll. Operator2 suffered injury to his head, left abdomen, and small scartch on his left knee. The accident was not reported by the people involved. IDNR was notified by the Freeport Emergency Room. Operator1 was a minor who did not have a boat safety certificate. The owner of both PWCs gave Operator1 permission to operate the PWC. The owner was cited for allowing a minor to operate a watercraft without a safety certificate and warned for failure to display a valid registration number on his PWCs.