Knowing whether or not the doctor's cause was a just one might alleviate some portion of the guilt he knew was sure to follow, but hearing that the opposition was worse was of little comfort. Still, he was glad Tsubaki had asked, small hope as it might be to cling to, or defense for his decision. He'd known right off that Kurogane wouldn't understand, but the man already hated him, couldn't he be relieved instead, that at least Yuuhi had some small reason to hang on and want to keep living? If Fai was this close, he had to at least try.

And what exactly did the doctor mean, bound to his service? No doubt it was much like any other wish he'd seen granted. A deal had to be made and both parties made to abide by the rules. He followed quietly, uncertain in his alliances, but resolute in his decision.

"The opposition. What are they trying to do?" he asked, echoing the question Tsubaki had tried. If he wouldn't say his own reasons or explain things for them, maybe he would be more willing to tell them about what they'd be up against.