It is him! Vash's relief is evident, but he still keeps his feathered arm behind him as he coming out of hiding to stand before Knives. His hands itch to reach out and touch, though! He can see Nai in there, so much more than he ever could see himself in the quiet Vash with the floppy hair who lived at the station house with him. His other big brother is who Knives would have grown up to be -- will grow up to be, he quickly corrects himself. Wherever he is, he's got Rem, and all their sisters on the ships. He'll be okay. He has to be okay.

But this isn't Knives. He shakes off the wave of grief, because this is Nai, this is his brother now! He's older, broader... he stifles a giggle. And with a much better haircut!

My brother here is Nai. He said Vash could call him Nai if he wanted to, so... was that not his name? Are you Knives now too?

For all his delight in finding another brother, Vash can't help but be aware of the number of humans outside, and the risk that, any moment, they'll be discovered. We shouldn't be here. This is a human place.