[Lea smiles a little when the not-cat hops helpfully back over to the other chair.]

Thanks.

[He pulls out the course textbook and starts to flip through it.]

Let's see... there's the 'B's.... and, ah here we go. OK, here's the spell that's on the board. Don't see a specific counterspell... but maybe... Ah, here we go. General purpose cut off spell. Probably wouldn't work if one of us was a lot stronger magically than the other, but since we're in the same class, I figure it should work.

[Lea studied it for a long moment, then pulled out his own wand.]

Alright; ready to give this a shot?