@ Slim: There's an implication of it, we can interpret their words (paraphrase: "let's do it my way") in any number of ways. If some of us can think that their words meant a particular action, then perhaps Geralt did as well. Regardless, I still dislike the idea of walking away when someone gets beat up by thugs, doesn't matter if it's a man or woman.
That's the problem- these people were acting like thugs, and not like soldiers. If the idea was to punish her for her crimes, then do that and be done with it, but they crossed a line with introducing excessive, sadistic brutality in their actions.
Let's not forget that Geralt came at them unarmed, and didn't use excessive force- they had an opportunity to escape.