[The worst part is that Law would hate it if someone was vague and ominous back at him, because he has Much Anxiety and doesn't like uncertainty.]

I meant if I was some sort of mercenary, why would I not be using my sword when I was working?
[A pause as he looks the shorter (Law's 6'3" so I'm assuming) man up and down properly, and then adds;]

Shouldn't a detective be able to deduce that sort of thing?
[Was that a joke? Only kind of.]