After hearing what the man waiting for Moby and Ellerby tells them when the two boys are called to the office during their study hall, how does Ellerby respond to the man's words?

After hearing what Cal Brittain tells Moby and Ellerby when the two boys are called to the office during their study hall, Ellerby tells Mr. Mautz that he doesn't need forgiveness from Mr. Brittain for something that Ellerby had nothing to do with in the first place.