The Professor's trick that hooks us so much is that we never know what goes through his mind, what he is thinking. I try to give that ambiguity."[12] The character's anger about Berlin's death spawned the character's motivation for part 3, and was an idea Morte gave the producers.[3] In September 2019, Morte considered the Professor a "very interesting character" who had story left to tell.[13] Morte said about part 4, "the teacher makes a descent into hell."[3]