User blog comment:Baylaust/RWBY Episode 9 Review/@comment-2006510-20130913215656

I find it a very subtle version of Weiss's 'trying to be nicer' promise myself :) Also, I thought it was more simple anger than jealousy.

I mean really, Weiss has probably had to follow rules and whatnot for years, had all of that drilled into her, etc. And now Ruby unwittingly does EVERYTHING that you're not supposed to do, and it's just driving her nuts (we see that), as pet peeves can do...

She could have easily yelled at Ruby during class (clearly she wanted to), but she turned it around to answer the teacher instead. So really, Weiss is actually making efforts on her promise, which can't be going too backwards, can it? XD