"All right, sir! Let me know if you change your mind!"

Students.

He should check with Tanidio to see if he managed to deal with whatever chaos was going on.

Tanidio is doing pushups!

A very useful way to spend his time that Bun is appreciating for its intended purpose.

"Well, it seems like nothing is on fire."

"You're terrifying the poor students."

"It's a balance of terror, then."

"You going to try to teach them actual medicine soon?"

"Once they can all pass remedial 'don't vivisect rats.'"

"What's wrong with vivisecting rats? They're rats."

There's a distinct expression of 'not you too.' "They can feel pain."

"Do they? They don't have souls."

Rats definitely have souls... back home. "Are souls something you can... objectively measure?"

"Beings with souls go to an afterlife, beings without souls don't."

"And people have checked for rats?"

"The queen has a devil retainer, I'm pretty sure she'd tell us if rats were going to Hell."

"... most of my arguments against rat torture rest on them being sentient."

"Well, you know, different worlds are different? Your world doesn't have halflings. Our world doesn't have sapient mice."

"I'd still prefer they did not--"

"Not very Evil of you," he said, truthfully. 

...he's right. If rats don't have souls, there isnt a good reason not to use them for educational purposes. "I'll apologise after dinner."

FUCK YEAH. ANIMAL CRUELTY. 

Tanidio pushes his luck with, "It was an honest mistake."

"Continual self improvement: the most evil thing possible."

"And someday Asmodeus will make us all perfect, with perfect knowledge of both the insides of rats and which things have minds."

Small smile.  "And presumably human insides too, which'd be more helpful."

"Dinner soon?"