Ah. For Knives, forgiveness is about not being hurt again. For Vash, it is not hurting others. He has more or less given up on not getting hurt, anyway. But that also, in all likelihood, surprises nobody.

Vash blinks, and hunches even more. "I don't have 'my' human. They each belong to themselves." Just as the plants do. "He did have a job. Under duress, unless I'm mistaken. He did it well, but then again, that's probably why he was chosen. I'm hardly more than that. I can see why he'd want to walk away as soon as he can." He knows Wolfwood's temperament, yes. Being forced to do things would not endear the one he was supposed to take care of to him. And Vash's self-esteem is in the negatives, assuming he's somehow an exception does not occur to him.

But 'if he really matters' certainly hits its aim. And now Vash feels guilty on top of upset. Par for the course. But also yes, he'll... reassess his estimation on whether Wolfwood would accept it.

... then his eyes go very round. "Two da-- when did I or Rem leave you alone for two days?!"

Nai had his powers manifest before it all came down so... even if he might have forgotten, or made to think it was normal, for Nai to hurt himself with such a power, they were rarely apart for more than an hour at a time?!