He could promise that at least. Mostly because he had no idea how he would take on a wound like that. He's very confused even though he thinks this is a good thing, he can heal people! Just like Ryo.

But he knows you need to practice and learn things so he nods. "I promise. I'll do my best."

He doesn't seem to find it awkward, after all shinki could die, even though they were already dead. It was confusing but it was just the way of things.