This and that. [ He pauses. It isn't a long pause, only a moment's hesitation, to give him time to feel bad about representing himself as a professor when he only did it for a year and then resigned in disgrace—so he feels bad for that moment, and then he does it anyway, keeping pace with her on the way to the edge of the camp, because it won't help anyone at all if she thinks he's dodgy. ] Before all of this I was teaching at Hogwarts. It was my first year, though.

[ And, with a combination of regret and admiration: ]

I was never good enough at Potions to be an Auror.

[ Also not good enough at not turning into a bloodthirsty monster once a month. Damn technicalities. ]