I'm guessing these are the correct definition:
1) [USER A] and [USER B] go to [Forum X]. [USER B] gets pissed off with [USER A] and bans him from [FORUM X].
[USER B] then moves to Bulbagarden, and begins slagging off [USER A]; either through [USER A] also having an account here, or by mentioning it on blogs etc.
2) [USER C] doesn't have a very good opinion of [USER D] and slags off said user on [FORUM Y]. [USER C] gets banned.
[USER C] then comes to Bulbagarden to continue said slagging off.
Under this rule, both [USER B] and [USER C] would get a 2-day ban.