Hi Bobbe, this part of the book was highlighting what Matthew 18 says about disruptive influences in the community. Most people tend to just avoid them and avoid meetings they go to. I've seen many a home group whither because someone in it was being incredibly selfish, or simply wanted to take over and no one knew how to approach them. Instead the other people just stopped coming. What I like about people who have a bit more maturity is that they don't mind sitting down and having a conversation, "Do you realize how much you take over a meeting and alienate other people?" Something like that. And they will interact with the person, helping them learn more effective communication if they want.
At other times people come in with a real desire to teach some aberrant theology or take control of people under their influence. When that happens the others need to be warned to give a wide berth to such folks.
Yes, I usually wait for a nudge, but sometimes I don't need it, because their toxic influence is so obvious, and if not approached they will kill it for the rest of the group.