I finally got a chance to watch the fight on HBO Replay, and there is no doubt what so ever that the Ref had already called the action to resume, and Mayweather nailed Ortiz.
Ortiz is a nice, likeable man. Mayweather is not. The natural response is to think something was amiss, but the simple fact remains that Ortiz forgot, for what ever reason, the basic instruction of "protect yourself at all times".
In the end, this will probably make a better fighter of Ortiz. In the mean time, Floyd Mayweather could care less.