Author is trying to pull Ainz shit because he is not in his body, lame way to explain that he "isnt" human, first he cared about the students and their emotions so he has human hearth(plus other stuff), then pull of they saw me better kill em now im inhuman.
The author needs to build a character before writing and not going to the route "Lets improvise what could go wrong" on a history that wants to be serious.