RedactedNarrative: Operator of V1 hit a wave and was ejected from the single person stand up PWC.  Operator of V1 was floating in water, unknown which side of PWC he was floating on.  Operator of V2, also a stand up jetski, stated he did not see operator of V1 due to waves and was following him at a distance of approximately 60 feet at a speed of approximately 10-20mph.  Operator of V2 struck V1 and also the operator of V1.  Operator of V2 realized what happend and circled back.  Operator of V2 entered the water and assisted operator of V1 as he was unconsious and face down in the water.  Operator of V2 moved his head from the water and then helped remove him from the water and assisted getting him on the swim deck of a nearby vessel.  Damage to V2 was limited to a cut and scratch on the foot plate where the operator stands.  Value was estimated at 100.00 in damage.  Operator of V1 was placed in a c-collar and on a backboard and transported to Broadstone Memorial in Superior, NE for evaluation.