He had just enough room to take a breath. He didn't even really believe it: Jim's mercy, a second time, his ability to just forgive this, to--smile, of all things, after this. If Spock were human, he'd indulge in some nervous laughter, because there was no other way to respond to it. Being half-Vulcan, he just blinked at him in mild confusion, before a slow nod. "I shall endeavour to be more honest with you."