I'll list the reasons why it is a rule -
2 and 3 obviously don't apply here. 1, I'm not sure if that was the case with what Trey was doing. It depends on the method. Maybe someone can confirm? 4, yes it does, but if it doesn't fall under any of the first three rules, I'm not going to make a big deal about it.1. Any mods online will get spammed with movement vio's if people block jump. This means we cannot see chat.
2. People started doing it in trade/buy rooms in pvp.
3. People can get over the wall in the Atrium, if the forced border plugin somehow got deactivated people could make the atrium map huge.
4. It falls under 'Glitching'
Its usually just a warning if we catch people doing it though. If people keep doing it then it would be a ban, sadly.