This excellent teamwork is a great way to demonstrate the hollowness of the girls' misguided beliefs about the non-human races. The MC was mistaken in trying to hold back the two by himself and could've been killed without his allies coming back to help, but they came back for him like true comrades.
I'm guessing the two girls are going to be captured after this. Amelia might even join his side given the story bothered to use a number pages for them just talking it out.