Shoshanna was actually having a good morning, and this lesson just shot it all to hell. THANKS, PROFESSOR.
She is seriously creeped out by both the fact that the bears have human fingers (shade of this, right?), and that they have to hex them off. Why would she ever want to hex someone's fingers off?!
She'll start to feel nauseated quickly and would definitely struggle to both perform the spell and keep her breakfast down. She'd probably have to come back from 4-6 (yay...).