To start off, it’s expected for power houses like Luffy or Zoro to stand up to an overwhelming enemy while on the verge of death, but it means a lot more coming from someone like Nami or Usopp that would turn tail at the slightest opportunity.
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In the last chapter, Nami was offered a chance to be spared. None of her crewmates would hold it against her for trying to save her hide with a white lie, but her faith and devotion to Luffy are greater than her own life.
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I can’t help but think this moment was in reference to this little moment the human duo had back in Act 2.
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It reinforces that the crew are equally a group of friends travelling as they are a Pirate crew. They are capable of making remarks and jabs at each other, but when push comes to shove, they will stand by their friends 1000%.
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But let’s not overlook Usopp, he stood his ground against two Flying 6 members by himself in the effort to protect Nami. He even took two headbutts for her sake, too.
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And after he’s put down, his immediate concern wasn’t himself, but Nami, assuring her it’s ok to lie in order to save herself, and later shouting for her to escape.
*by KiriNigiri