"Let’s pair up!  I want to see you practicing non-verbal  expelliarmus  and  petrificus totalus  on each other.  I know it sounds basic but these are ones you should have down, and if you don’t we’ll need to work on it before moving on.  If you and your partner can demonstrate it for Newport or me, you can help your friends learn.  Got it?"  Jansen paused to get the class’s agreement, then his mouth turned down slightly and his voice dropped.  "And if I see any, and I mean  any even whispered, unforgivables, I will have you bound in McGonagall’s office before you can blink.  Understood?"  The replies were much more vocal and swift that time.  "Alright, get moving!  We’ve got two hours to sort out how far along you all are."