[quote=@Card Captor]
<Snipped quote by Pacifista>

It wasn't about it's ability, only it's appearance. Which so far seems to be only an arm. I was hoping that would be inferred by the context (he was thinking about how his Stand's range compared to the others)
[/quote]

Fair enough. Bruno's stand is active whenever he moves his arm so I guess it makes sense they'd at least know that was something to do with it.