[Meeting an almost-mirror-image is certainly strange, but Ginko has seen much stranger -- what's more, he's not unused to being observed; as a child, he had been "the unnatural child who brings disaster wherever he goes". Even now, the guardians of the mountains and forests tend to watch him as he passes through. He cuts an unusual figure, with his hair and eye color, themselves the result of an encounter with the supernatural, so it doesn't trouble him at all to quietly wait out the other man's reaction, and he makes no move to draw attention to the matter again once Break has returned to the book.]

If you were teaching people ways to tamper with the very fabric of reality, wouldn't you want them to begin with feats so mundane as to be unnecessary? The consequences of a mistake would be much less dire than, say, if the potion were meant to save someone's life.

[Whenever anyone associated with mushi take on apprentices, they always begin with the easiest and least important tasks, and even these can carry risks.]

Besides...an effort that can lessen someone's pain, however little that is...that seems worthwhile to me.