It's not quite Stockholm Syndrome, but his classmates aren't entirely wrong about Murata Tamura getting used to Kizaki's bullying-but-not-really-malicious-intent.
@justforthelulz
i think he's more confused than anything?
Like "that guy that keeps bullying me in this weird non threatening way?? How am I supposed to deal with that??"
So he ends up being in this weird zone of "I'm scared of my bully, but not really" and he has no idea how to deal with that.