I'm surprised this part got dropped as just a volume extra. There seems to be some issues with this translation though? Reads kinda weird, but I'm also just going off what I read in the translation of the LN.
Page 13: "And the teacher also... huh?" seems off. You can probably just go with "Sensei too, I like you very much."
Page 17: Should be a continuation of the previous page, with the sensei warning her about the dangers of wandering around at night. "How was I supposed to know something like this would happen?" doesn't seem appropriate. Then Rin kinda pushes sensei to show her what would happen if she encountered someone dangerous.
I'm only done the first volume, but the LN is definitely worth reading. You get some more insight into what Rin is thinking.