Thread:PikovajaDama/@comment-28323821-20160305184717/@comment-16241899-20160306002744

No, it is not. To be good with a crossbow he needs to be trained in that discipline, so I would assume he has used crossbows before. It is not crucial for the crossbow to be made by Piero for Corvo to be a good shooter. That, however, is what the context is referring to, his general abilities with various weapons.

Edit: And I am not a native speaker either, so you are fine ;)