Blackwell (series)/WMG

Mild spoilers--Joey learned how to hurt other ghosts by getting hit in the face with a saxophone
In game one, Joey says that ghosts don't normally feel pain, but he's "learned a few tricks". The first time we ever see him get hurt is in Blackwell Unbound, where he got hit in the face with a saxophone. So how'd he learn to hurt other ghosts? From getting beat up by Issac's sax.