As he is getting closer, and yes, still calling out, gently but persistently, he can feel... something different about this person, and he blinks at the disjointed wave. He doesn't feel like a human. He feels like, well, the only other Independent he knows, except. So much fainter? The realization makes his mental call out hiccup and then fade for a moment, as he stands and tries to make out the features. Except... he needs to come closer, so he does.

It's... less the dark hair (he's not gotten that memo yet) but certainly the wrinkles that make it finally sink in that it might. Might. Be his brother. So he yelps, and steps even closer, but stops at a reasonable enough distance away to not be a threat. It takes him a couple of attempts, lips parting but nothing coming out, before he finally manages to make another sound.

"... Nai?" It might be another independent, he thinks, somehow, but something in the way he carries himself makes Vash think it more likely that it is indeed him than anyone else, or random.