The spirit will take you more seriously that way.
. Whatever you do, don’t forget your holy water and crucifix, and make sure to have the whole ritual down before you start. You might need to perform an exorcism on his behalf. You want your friend back, don’t you? Or, is the entity just making faces at you? It might be a bad sign if he’s saying strange things, has unexplained wounds, and has been levitating a lot lately.