An ANGST moment! Not from the series.
Zoro has sworn on his dead friend's sword to become the greatest swordsman in the world and to never ever give up-to die trying isn't even an option.
He has also promised his master before he left to the seas that no matter how desperate things became there would be a line he never crossed, a oath he'd uphold by himself even if it risked him everything.
But right now Zoro looks at the kid whose standing before him, between him and the antidote his captain needs, refusing to back off armed with a gun, and Zoro fully understands probably for the first time in his life, the sad smile his master had given him with the words of wisdom that Zoro had been too young to understand then, to never say never because vows and pledges are just words, promises made that are intangible and uncatchable like the wind that brushes through his hair now, that such can simply not be touched and that they are illusions, simply not real. And the only thing that's real, the only thing Zoro can feel with gut wrenching, heart stopping clarity, the only thing that matters isn't the kid, nor Zoro's own promises and oaths, but the helpless weight on his back and the breathing in his ear that's just getting slower and slower.