Moths aren’t as good at color as human, but their color vision is specialized at distinguishing between blue and green. As a licensed moth, Crunch is thus an expert at distinguishing between Cinnamon’s arrows and Liri’s arrows. Wait, how far ahead do I plan this comic? Or did I find that information out literally just now as I upload the page? Am I a genius or a fool?

We’ve seen Liri’s bow shoot blue arrows back in Chapter 3. It is surprising Cory remembered that, because we was out cold when it happened. Maybe Liri told him between chapters? Hm….

Also, if it’s unclear here, in panel 4 Sage is postulating that Cinnamon got a new bow and killed Cassette with it, not that Liri has two bows for some reason.