I get what Trent is saying. I think we see it happen here quite a bit but I think it happens in live conversations too. I think it is ok to make a post to nudge people back to the topic especially if there are still enough participants who are not done with the discussion. If the topic is one that really has momentum a knob will not be able to derail it. Once a topic has outlasted its useful life and is starting to die down, having it go OT is pretty easy.
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