Despite his cavalier attitude afterwards, it was pretty clear that Shiro had just laid bare a piece of his soul, and Mihai'en was both grateful and saddened by that. 
It had only been for a moment, but in that brief span of time, the icy demeanor of the man across from him had melted, and he had looked... sad. 
He would've offered his condolences, but it was clear that he hadn't wanted to say much more. Most people would've simply sat there: somebody lunging after a rabbit was usually giving a pretty clear sign that they wanted an end to a conversation.
Still, though, that was pretty damn impressive. Most people wouldn't have been able to move as he had, nor so quickly. Then again, living alone in the woods requires a set of skills beyond that of normal men. 
As to the rabbit itself, though, he found that he wasn't very hungry at all. 
"Again, I thank you for your hospitality, and your... frankness." He smiled, genuinely. "But as you understand, it's been a long day. So if you'll excuse me, I'll take my leave. Wake me if you had need of me for watch."
And with that, he found somewhere comfortable, and fell asleep.