Yep, this is right. Some threads get acrimonious and are thrown into the Pit. Some Pit threads get huggy and are thrown out of the Pit. The rules for what can and can’t be posted in a given thread are based on what forum it is in when you post, not what posts are already in the thread.
Since we’re now in MPSIMS, let me say that I’m glad you’re now a full member, Pythian Habenero. I expect you’ll be a great addition to the boards.