So we saw a couple of instances where Cavendish and Ferus were able to redirect gauntlet fire and use their enemies' own shots against them. I found it odd, then, that Cavendish was essentially a non-factor in the concluding airship battle. Since the cannon discharges are much more powerful than gauntlets, I can see it being too taxing for an etherealist to outright loop fire back against the attacking ship, but it seems odd she didn't even intervene to disrupt their aim or focus.