RedactedNarrative: On December 2, 2022 at approximately 15:16 hours, I received a call from park dispatch of an adult male with a laceration to his upper right thigh aboard a Good Samaritan vessel in route to Las Vegas Boat Harbor.  USPRs (US Park Ranger) and I responded direct to the scene via patrol vehicles.  Boulder City Fire ALS Ambulance and Mercy Air helicopter were requested.  
  
  At approximately 15:30 hours, we arrived on scene with a 34'' 2022 Sea Ray Sundancer cabin cruiser vessel occupied by three individuals. The vessel operator was later identified. We contacted the patient who was lying in a supine position on the rear swim deck.  VICTIM had a deep laceration to his upper inside thigh.  The laceration injury was consistent with a strike from a vessel propeller which was under power at the time of incident.  USPR, Paramedic, took primary patient care.
  
  Following on scene wound care and pain management, VICTIM was transported by gurney to a Boulder City Fire Department ALS ambulance.  
  
  I re-contacted vessel owner/operator, and vessel passenger/witness on their vessel at the Las Vegas Boat Harbor courtesy dock.  A field interview with OPERATOR and OCCUPANT1 indicated the following:
  
  OPERATOR and OCCUPANT1 had left Las Vegas Boat Harbor at approximately 14:00 hours, in route to the Hoover Dam.  Approximately 15 minutes into their voyage they were waved down by VICTIM who was afloat on a disabled 2021 Bombardier Sea-Doo GTX 300, in open water between the Hemenway Wall and Boulder Island.  
  
  They contacted VICTIM and attempted to secure his PWC to the back of their vessel.  They were unsuccessful on first attempt. Upon second attempt they were able to secure the PWC to their vessel.  During said maneuver, VICTIM and a detachable gas canister fell into the water.  OPERATOR stated that they told VICTIM to get in the vessel and they would retrieve the gas canister using a poll net.  VICTIM refused and swam to retrieve the gas canister.  
  
  Upon retrieval, VICTIM swam to the rear of the vessel and while attempting to place the gas canister on the swim deck, he was “sucked under" the vessel and came into contact with the vessel propeller.  OPERATOR stated that he believed the vessel was in neutral at the time, however VICTIM''s injury appeared consistent with a propeller under engine power.  VICTIM was loaded onto the swim platform and OCCUPANT1 called 911.  They transported VICTIM with the PWC in tow to Las Vegas Boat Harbor.  
  
  On December 3, 2022 at approximately 11:00 hours, I conducted a telephonic interview with VICTIM.  VICTIM indicated the following:
  
  VICTIM was on his PWC between the Hemenway Wall and Boulder Island, when smoke began emanating from the PWC engine compartment.  He shut down his PWC and contact NPS Dispatch for assistance. While await a response, he waived down the Good Samaritans in the cabin cruiser.  While securing his PWC to their vessel, he fell in the water and swam to retrieve his detached gas canister.  
  
  While swimming towards the rear of the vessel, he observed the vessel moving backwards towards him.  He was unsure if the vessel was under power in reverse, or his waves were pushing the vessel towards him.  When he approached the swim platform he was sucked under the vessel into the moving propeller.  
  
  He was transported by the Good Samaritan vessel to Las Vegas Boat Harbor for medical attention.
  A USCG vessel safety inspection was performed on the cabin cruiser.  The vessel had all required safety equipment aboard.  VICTIM was wearing a properly fitted USCG rated Type III PFD at the time of incident.  No alcohol or controlled substances were observed aboard either vessel.  No individuals on scene showed any indication of impairment. 
  
  Statements and on scene evidence indicate that operator inexperience (...
  