Luke 9:49-50
And John answered and said, Master, we saw one casting out devils in thy name; and we forbad him, because he followeth not with us. And Jesus said unto him, Forbid him not: for he that is not against us is for us. (KJV)
In response John said: “Instructor, we saw a certain man expelling demons by the use of your name and we tried to prevent him, because he is not following with us.” But Jesus said to him: “Do not YOU men try to prevent [him], for he that is not against YOU is for YOU .” (NWT)
In response John said: "Instructor, we saw a certain man expelling demons by the use of your name and we tried to prevent him, because he is not following with us." And Jesus said to him: "Too right! If he is not an authorised Witness of Jehovah then you should inform the Governing Body and they will stop him." (New NWT).
OR
In response John said: "Instructor, we saw a certain man expelling demons by the use of your name and we tried to prevent him, because he is not a member of our Kingdom Hall." And Jesus said unto him: "Do not YOU men try to prevent [him], for he that is not against YOU is for YOU. (New NWT).
Committee have not yet decided on this, but the first option is preferred, but perhaps a bit too brave.