The wand movement they needed to practice would be easy. Sometimes when Toby was bored or distracted he would absentmindedly do that wand movement anyway, which could sometimes end up with random things bursting into flames and therefore ending the Hufflepuff's peaceful trances. But that was besides the point. The here and now was that Toby had this part covered.

But still he practiced it, because it was a lesson after all. Picking up his wand again, Toby swooshed it in that same infinity sign. And then again. And again. Easy. He just kept practicing that until he heard Fuller say anything about moving on.