RedactedNarrative: On Tuesday, August 18, 2015 at approximately 1000 hrs., I was on patrol in MNRP Vessel 845 on the Sinepuxent Bay approximately 1/2 mile north of the Verrazano Bridge which is the bridge that crosses the Sinepuxent Bay from the mainland to Assateague Island. At that time I observed a group of rental PWCs stopped as the guides gave final instructions prior to releasing them to ride the area. The instructions lasted about 5 minutes. When the guides released the PWCs, I stopped my boat toward the eastern side of the bay close enough that I could respond should I observe a violation.  Within a minute or so I observed 3 PWCs southbound at a high speed. The front two, one behind another. From my angle I was unable to determine if one was behind the other or one off to the side. The rear PWC was closing in on the front one. The third one was further back and was moving faster toward the front two. I could tell that this PWC was operated by a PWC guide because he was wearing the required orange vest. The front two looked like they were closer than the required 100' distance. It looked as though the guide was attempting to catch up with them to separate them. Before he could do this, the second PWC had caught up with the front PWC and suddenly turned to the right and the PWCs collided. This happened about 100 yards from me. 
  
  Immediately I proceeded to the scene. The guide was on scene seconds after the collision. As I arrived, the guide made contact with an adult male who was in the water. I asked if he was conscious. The guide replied no, but he was breathing. I radioed DNR advised them of the accident, that one subject was unconscious, and it's location. I also requested DNR have EMS respond to the Assateague boat ramp. After determining that the only other injury was to a young female who had been on this gentlemen's PWC. Her injury at that point was a cut to her elbow. I advised a second guide on the PWC to stay with her until I returned. I went back to the unconscious subject. The guide and I were able to pull the subject on board my vessel. I initially accessed the subject. He was unresponsive, did not react to painful stimuli, his respirations were 12 and labored. I advised the guide that I needed him to monitor the subject while I operated the boat, he said ok. We headed to the boat ramp. Periodically I would look back to see if the subject was still breathing which he was. At one point the guide said that he had quit breathing. I had him readjust his head and immediately started breathing again. I did however notice that the subject was starting to "posture" which is an indication of a brain injury. When we arrived at the boat ramp Park Assistant Manager who is a EMT-I took over patient care. By this time the subjects respirations were 6 per minute and shallow. EMT-I cared for the subject for about 5 minutes until Berlin EMS arrived on scene. Berlin EMS transported the subject to PRMC in Salisbury.
  
  I then returned to the scene and contacted the other injured subject. Upon my arrival she was complaining of back pain and was unable to stand. I radioed DNR and requested another ambulance to respond. After I had loaded the young girl onto my vessel, another PWC arrived with two female subjects onboard. It turned out they were the young girls mother and sister making them the unconscious subjects wife and step daughter. I advised the mother that her husband had been transported to PRMC in Salisbury and that I wasn't sure of his condition. We then went back to the boat ramp where we were again met by EMT-I who treated the injured girl until arrival of the second ambulance. She too was transported to PRMC in Salisbury. The mother and sister rode in the ambulance with her. 
  
  The operator of the second PWC said that he was not injured.
   
  I returned to the accident and observed that the PWC that Operator1 had been operating had received extensive front damage on the port side and was partially submerged with just the bow of the