Operator was operating PWC and pulling victim with another person as observer.  victim said he was just too heavy in the water for the PWC to pull him up causing operator to use a lot of throttle.  The excess throttle with victim weight caused him to pull his hamstring.  

He was transported to medical clinic and discharged with pulled strained ham string.
No harm or fault of operator or skier.  

CONCLUSION
Injury occurred while doing a sport
garden city