RedactedNarrative: On 082616 at approximately 1500 hours V1 was on a pwc tour in Boca Chica Channel. The tour guide V2 while underway pulled the engine stop lanyard as he was leading the tour.  V1 following behind V2 struck V2 from the bow to stern. 
  
  I contacted tour guide after his return to Key West for a boating accident interview.  I interviewed tour guide at his residence.  He stated as the tour guide he gave instruction to the group on safe operation specifically maintaining a safe distance from each other, personal watercraft controls including the loss of control (off-throttle steering), no brakes on the craft, hand signals, safe distance to operate (300 feet) to give space need to avoid other operators if they fell or slowed in front.  After the demonstration ride the tour guide took the group through Key West Harbor around to the south side of Key West to Boca Chica channel.  He said they made stops keeping the group together, passing along facts about the environment, and reminding them to respect the safety of each other and stay a safe distance away from other pwc's.  The tour guide continued north under the Boca Chica channel bridge making a stop for another talk east of Key Haven.  The tour guide stated shortly after leaving the stop his safety lanyard (emergency stop) became entangled and popped off shutting down his engine.  The tour guide said he raised his arm as he came to a stop and turned expecting the pwc's behind to do the same.  The tour guide saw Operator1 behind him but not looking at him.  The tour guide said he stood up and waved his arm but could not see Operator1's eyes.  The tour guide said Operator1 continued directly at him at full speed striking the tour guide.  Both operators and passenger were ejected into the water.  After climbing back on the personal watercraft the tour guide and the group returned to the livery.   The tour guide's injuries were diagnosed as abrasion on right hip, large bruise/hematoma on left buttocks, fractured ribs, lacerated liver.   
  ; tour guide: Struck by a following personal watercraft, the tour guide's injuries were diagnosed as abrasion on right hip, large bruise/hematoma on left buttocks, fractured ribs, lacerated liver.