I liked your teaching analogy. In other words you as an expert are able to respond to your students and adjust the task as needed. Because you are an expert you have several ways to work on vocabulary skills, so you are able to change your plans and still achieve your overall goal.

Unfortunately, I tend to be that pain in the butt student who may be preoccupied with what you are doing and with what I am doing, that I miss the point of the lesson.

Honestly, I am also the student who is very good at hiding in the back of the room, not drawing direct attention, appearing understand what is going on, but in reality being totally lost and hating school.