Answer:
He would know he was just a victim of the door-in-the-face technique.
Step-by-step explanation:
The door-in-the-face (DITF) technique is a form of getting an individual to adhere to or obey the person carrying it out.
It is given this name because the persuader will first ask for a big, almost impossible request which he/she knows will most likely not be accepted and then he/she would ask for a smaller, more reasonable request which will most likely be accepted. It is a sequential form of persuasion.
In this case, Jeremy asks a request he knows will be turned down and once it is he asks for a more reasonable one which is accepted by Professor Williams.