I say, we can talk about false prophets later if you want, but the good news of the Kingdom is all I'm talking about right now.
That is classic JW style, try to derail the conversation and talk about what they want to talk about. Good for you to keep them on one subject.
I had to tell a couple of elders that when I met with them- a meeting I had initiated BTW. Instead of talking about what I wanted to talk about, they tried to steer the conversation to my spirituality, or lack thereof. I told them that since I initiated the meeting we were going to address only my matter, and if they were that concerned about my spirituality, we could make an appointment to discuss it at a later time.