@Coruscation:
Well it looks to me like he isn't quite done yet with how he resolves that he can't just stand by and watch someone die. I can easily imagine him busting out his swords for a final attack before succumbing to his lack of air.
His mouth is open and all the air is escaping. I think Zoro is done holding people off for now, until he can get a few more breaths. At any rate, this secures that Luffy will have to go back. Either that or the Princes will be quickly on their way. Whatever happens, the King and those Straw Hats will have to be saved (unless Usopp has something that can help them escape, but I doubt it).
Oh, and Sanjino, Nami herself is over it, but this is still a grave matter revolving around her and everyone she loved being tortured and the death of her mother. She now knows a lot more about the Fishmen, why they behave in such a way and the dark history that spurred those like Arlong on. So the fact that we're finally going to get to see what happened that would unleash Arlong on the East Blue still holds great importance.