Not a software company : Manager hitting on his employee, what should I do?

I have a college who was out with his team in a party, the manager was talking to her entire party and then started trying to hit on her and even touch her, kept getting her drink, my friend tried to move but he again moved to her, one of the guy sepetated them, now when I asked my friend what happened last night she doesn’t remember any thing , what should I do ?