Check the main page.
I am trying to find rule you mention and to further define what is meant by "incident" from thread to thread but might be overlooking it (on Home page). Any help would be appreciated.
Don't jump threads - If you get involved in an argument in one thread, it's considered poor manners to restart the previous argument in the middle of an unrelated thread.
http://www.freerepublic.com/help.htm#guidelines