Giovanni says that the future murderer drove 63 of 70 students away from her lecture. If true, that seems to have required quite extraordinary behavior - even given contemporary academic standards.
LOL! Maybe you didn't mean it as a joke, but as a new professor, it's funny to me. I think you are quite correct.
I teach at a small university, and on the first day of the semester I distribute a document that lists the expected behavior for each grade. Under “F” is the phrase: actively prevents the learning of others. Let me tell you, the first time I noticed such behavior in him (intimidating appearance, cell phone, etc) I would have confronted him and told him that he was working on an F.