RedactedNarrative: PWC 1 was having mechanical problems. PWC 2 followed PWC 1 to assist him if his PWC 1 became disabled. PWC 1 turned to port without looking behind him. As operator 1 did this, PWC 1 collided with PWC 2. The operator of PWC 1 fell off and swam back to his vessel. PWC 2 towed PWC 1 back to shore. One injured. Unknown property damage.