Update on Corporate Creep

The person I initially told about the work situation in a previous post still hasn't spoken with the offender, so I spoke with someone else who has told me that they will talk with the offender. I have a feeling that this person actually will. 

We shall see. This situation has peaked my curiosity, however: why has the person I told initially still not reported it? Research suggests that for victims of workplace harassment, fear of retaliation can be a factor. But what about people to whom the incident has been reported? Perhaps the person fears retaliation as well.