Emmy looked aghast at Professor Tate - was he out of his mind?! Ok, so it was only a scenario, but even so, he could have chosen a better one...
Putting her hand up, she said, "Well, I'd get into a defensive stance, but ready to run if necessary, I'd draw my wand, and I think I'd use Lumos maxima, so that I could see what I was up against. Of course, if that didn't work, I'd use the Impedimenta Jinx, sir." Not her best answer, but it covered most things...