You may have already heard of this through the proper channels. After all, Aunt Cassie literally   flooed    to Hogwarts after hearing of the incident through Draco and Narcissa. Aunt Cassie not only berated our headmaster but came to tell me and Theo (and Draco by proxy, the traitor) that were anything suspicious to happen again to tell her immediately. In case she hasn’t already told you, what happened then was this.