RedactedNarrative: V1 was towing a tube with 3 juveniles aboard.  As v1 was circling, v2 was drifting.  Operator of v2 noticed he was drifting close to where the tube was going in circles.  Operator of v2 tried to engage the boat to get out of the way but to no avail.  Injured struck the bow of v2, impacting the area of his mid thigh.  The force caused the injured to hit and break the windshield. Right femur was broke and internal bleeding, he also had a laceration under his right jaw line as well as another laceration on his right eyebrow