He should sue this woman. And I am not advocating for any law firm or propping up that system, but seriously.
This is the second time I’ve seen this story, and neither version mentions anything beyond the campus security department’s routine follow-up to the professor’s complaint, of asking the student what happened (presumably something the campus police are required to do in response to any formal report or complaint they receive from anyone affiliated with the school, no matter how idiotic it may appear on its face). In all likelihood, the matter ended there, with campus police snickering at the professor’s idiocy, and sending a routine copy of their report on the “incident” and follow-up to some administrative office, where further snickering ensued.