Board Thread:General Discussion/@comment-130.245.192.22-20170629055623/@comment-4010415-20170630031900

Perhaps the trigger opens the exhaust port, while the hammer bumps the vial that's between it and the exhaust port, thus causing a puff of Dust to come out of the vial and onto the blade. Something about the nature of powdered Dust may allow it to actually stick to/settle on a blade instead of just sliding right off.