[It's a bad habit of his. To always feel the need to sound like the smartest person in the room. A pathetic remnant from his past life, where everything depended on him being able to keep up the conversation and appear always mature and more educated than others. He might've stopped pretending but some habits die hard.

Akechi raises the vial against the streetlight to inspect the liquid. Then he opens the cork and takes a quick sniff at it. A strong smell hits his nostrils. Is that anise? Maybe.

Then after that he offers the vial back to the man.]

Could as well be colored water, one that was used to boil herbs. We do have healers here, you know. None of them have mentioned of such 'cure-all medicine'. And don't you find this whole set up shady? A miraculous cure just happens to appear when people are feeling the most vulnerable?