@Echonic:
The troll was innocent!
As the MC noticed someone cast a spell on the girl so she walked to the troll even against her will.
Then another spell caused the troll to go berserk.
So the point is that it seems likely that someone does not want anyome to think positively about trolls.
Maybe whoever cast the spells had a bad experience with trolls or maybe that person belongs to those benefitting from enslaving trolls and for such a reason that person will not want anyone to even bring up the idea about trolls being a type of "humanoid race" instead of "magic beasts".
As such the questions are if the MC who noticed the spells will think about this and how he will act on his conclusion as well as how their group will develop in this direction regarding equal treatment to all "humanoid races".
That means there is potential in the story as long as the author does not throw it.
Therefore we gotta hope the author will work on that theme in the next chapters.