"Flipendo, sir, the Knockback Jinx, isn't only used to physically repel an opponent in a duel. You can use it to knock away objects from you, too." Alice refrained from saying that the jinx was something she would use, considering some much better options had already been voiced. But it was her answer.

Yet.. hm. "This is a Charms class, though, so if I had to use a charm that hasn't already been named.. Mobiliarbus would be good for levitating the object away from me, if I could do that much."

She completed her answer, only to find that now people were pointing out the flaws and weak points in his scenario. It made Alice doubt she could even perform a spell if she was in this dire of a situation, but this sixth year wasn't interested in the finer details until Professor Facial Hair elaborated on this hypothetical a bit more.