STA.....context is key.
15If your brother sins, go and show him his fault in private; if he listens to you, you have won your brother. 16But if he does not listen to you, take one or two more with you, so that BY THE MOUTH OF TWO OR THREE WITNESSES EVERY FACT MAY BE CONFIRMED. 17If he refuses to listen to them, tell it to the church; and if he refuses to listen even to the church, let him be to you as a Gentile and a tax collector. 18Truly I say to you, whatever you bind on earth shall have been bound in heaven; and whatever you loose on earth shall have been loosed in heaven (Matthew 18:15-18).
I guess he hopes that Lurkers will be taken by it and rush to the nearest Catholic church and throw themselves on the altar.