The teacher smiles and tells you not to worry about it. Everything will be explained in due course. This is driving you nuts. Is it wrong to hit a teacher? If this was an essay, it would be easy. You at least would know what it is that you had to do. If you couldn't figure that out, there are always ways of getting a copy of an essay from somewhere else, that will get good marks. But this? This is crazy!
Depending on what the pressures are on the student, what they have come to expect from their schooling and how trusting they are of their teacher, this is a completely understandable reaction. Students who are used to playing the "education game" of jumping through hoops to get marks to get on to the next level need to know what the next hoop is. They need to know how they can successfully navigate the obstacle that you are putting in their way in order to get to the next level. What is being proposed here is high risk. If they don't know every detail of the assignment, then they don't know how to play the game.