...I think you’d have to ask that of the Guild help desk and the masters themselves to find that answer. It wasn’t in the library. I guess this means the deeper secrets of any job belong only in the hands of the Guild and it’s members. That would make sense.

[He glances about the hall and nods to himself.] That would prevent any abuse or misuse of any skill. And a skill like that needs used only by people who will respect and use it properly.

But I doubt there are any speakers involved.