If an experienced teacher started at Hogwarts: Part 3

 Professor A.Teacher: Professor, I'm planning my first end-of-year exam. Do you have any tips?

Professor Trelawney: Tips?

A.Teacher: Well, how do you examine your students?

Trelawney: I simply rely on the echoes of the future, to see what I must examine.

A.Teacher:.... right. And what do you.... see?

Trelawney: This year, I forsee that the examination will be based on crystal-ball gazing.

A.Teacher: OK. So what do you actually do?

Trelawney: I invite them up into my little dwelling, one by one, and invite them to do a reading for me.

A.Teacher: And by reading, you mean...

Trelawney: I ask them to gaze into the ball, and tell me what they see

A.Teacher: So you ask them to look into the future?

Trelawney: Yes, obviously. That is the fundamental purpose of my art.

A.Teacher: So... how do you know if they've got it right?

Trelawney:.... Excuse me?

A.Teacher: How do you know how to mark them if the events they are seeing haven't happened yet?

Trelawney: I myself and well acquainted with the future.

A.Teacher: But what if a student sees something that you have not seen? What if you have a student with more of a gift than you?

Trelawney:.....

A.Teacher: You haven't "forseen" how you would deal with that?

Trelawney: I hate you.