At approximately 2 pm V1 & V2 launced their PWC's at the Elk Rock boat ramp.  The vessels started heading west and went under a small bridge to continue cruising west into Teeter creek area of Lake Red Rock.  V2 stated his son was on V1 and traveling in front of him off of his left side.  V2 stated his attention was diverted for a brief moment and didn't see that V1 had stopped his PWC in front of V2.  V2 let off of the throttle as he was heading toward V1.  V2 tried to steer away but panicked and forgot that he didn't have any steering control when he was not on the throttle.  The bow of V2 struck V1 on the starboard side and the bow of V2 rode up the side contacting the right leg of operator on V1 causing a laceration to his right ankle and a bruise to his right thigh.
Knoxville                     