RedactedNarrative: Unit 2 was cruising near River Bend on Lake Murray.  Unit 1 was traveling in the same direction and struck Unit 2 at the stern.  Unit 1 traveled over the stern striking the operator of Unit 2 in the head.  Operator of Unit 2 received facial lacerations as a result.  Operator 1 was responsible for the accident.  Alcohol and improper lookout were causes.