I would share something welcoming
I wouldn't shove it in their face like "you NEED to do something," but on my own time, I would look up what they can do and share something very welcoming like counselling. Or, "Hey, I looked it up and I saw that if you don't want to see them in class, you don't have to!" I think having many different avenues would be like, "by the way, you don't have to report it- you don't have to do the investigation thing, and you can still not see this person or deal with them.
Recommendations
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Ensure all sexual violence prevention and response education and training opportunities actively deconstruct victim-blaming, rape myths and gender norms. Ensure these sessions take an intersectional approach to understanding sexual violence and supporting victim/survivors.
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Emphasize the victim's right to decide whether they would like to report the incident after they have disclosed it to the university. Ensure the victim is aware of the formal and informal routes for reporting, including the option of reporting to the police. Clearly communicate any limits to confidentiality.