Gov. Wanda Vázquez fired the island's emergency director Saturday after the incident set off a social media firestorm.
Drexel University Professor Chikaodinaka Nwankpa was arrested and charged with using the money on "adult entertainment ... and iTunes purchases," officials say.
Many say they'll be staying as far away as possible from the demonstration they worry will turn violent.
The decision comes after the student worker union filed a grievance against the school, saying it was purposefully underscheduling students to avoid paying tuition remission.
Video captured Seth Lookhart extracting the tooth of a sedated patient as he rode a hoverboard.