system
Given the following post, respond as if you're commenting on Reddit:
human
[Vermintide 2] Is Kruber violating his oath as a grail knight by using grenades?

The whole no ranged weapons thing.    

Side question, is there some form of ranged combat that a Bretonnian knight can engage in without violating their oath?
gpt
The spirit of the knightly oaths is all about chivalry, about the nobility of honourable combat and disdain for the dishonourable.

Everything about the Skaven is the complete antithesis of honour, nobility, and chivalry. To them, cowardice is a virtue, honour a weakness, and chivalry a concept so alien that they would be unable to grasp it on a conceptual level. They are not foes to be faced, but vermin to be exterminated. If the Lady was here, she'd back me on this - you use whatever means are at your disposal.

Except crossbows, of course. Crossbows are blasphemous.

(Side note: While obviously no knight of Bretonnia would even consider fighting in battle other than with the noble lance (Questing Knights aside), the fact that they see no problems with bringing along peasant bowmen, and even trebuchets, suggests that these are acceptable tools to employ in battle. While they would never normally deign to soil their hands with the tools of the rabble, needs must as the Horned Rat drives)