RedactedNarrative: Operator of vessel 1 ties a clothes line rope to the rear of vessel 1 and attached the opposite end to a black truck tube. The victim was sitting in the tube and had wrapped the rope around his left hand and thumb. The operator proceeded to drive away and the rope tightened around the thumb of the victim. Victim sustained a severe laceration completely around the base of his thumb. The victim stated he has complete numbness in his left hand and the injury appeared to have substantial bleeding.  Operator was issued for no observer.