Even if the leader was cool and took responsibility for his team's actions, those actions were still "attempted murder" or at the very least "assault". The actual aggressors dont seem remorseful. I'd need more than a bowing of the head and heartfelt apology, else those guys would either have lost their jobs or their heads.
Problem is, who is going to judge them.
They are already in a profession were they can die anytime and there aren't enough people to do the jobs required, so conflict between groups are ignored a lot of times because it's too much hassle. Plus law & order is just a vague concept, and only considered when something really serious happens.
I mean, just take a look at how the Guildmaster didn't do a thing to that Guy & his partners who left MC to die, even after MC had informed the truth to her, as there wasn't much she could do about it just with the testimony of the victim.
You can't really judge every situation based on modern society norms either.
And Authors regularly use these middle age or older era settings primarily because of how bad or vague the concept of law and order were there back then. It gives them the leeway to do anything they want without worrying about the societal implications within their story.