@AliceCheshire They're still getting angry at her for her sake. If Myne were this lenient in front of any other nobles aside from those present, they would have thought her weak and started plotting against her. As it is, Hasse is still a place where she can make "mistakes" like this and learn from them, but she has to do "better" in the future to avoid increasing the danger coming at both her and her dependents, which range from not just the gray robes under her stewardship (including the Hasse orphans) but her family and friends back in the lower city.
That all being said, Myne got really, really lucky with Brigitte. Myne made the internal comment about how Brigitte was holding back for Myne's sake, but the other part is Brigitte herself probably understands better than most other nobles that such behavior by commoners is normal. I would not be surprised if Brigitte held back also to give the kids a chance to survive their mistake. Harsh enough to not be seen as overly soft, but soft enough that they're not going to die then and there. That's the sort of balance Myne herself needs to learn for the future.