The teacher didn't back down. Despite his youth, Bert was able to produce a decent stern teacher face. This look was on his face now. He wasn't impressed hearing about Andrei's clan. Considering Andrei's description of them, Bert wasn't surprised they were gone now. But Bert was sure that pointing out the defecits in Andrei's family would not help.
"That's a shame you have such a low opinion of the place. But I hope you're not mistaking self-control for weakness. It takes great strength to be self-controlled. And it's needed to survive today. Nearly four hundred years of being a vampire has taught me that. And there are ways to survive other than manipulating and killing. And I don't mean just those blood bags." The expression on Bert's face showed that he didn't think too highly of those.