A locked thread cannot be posted in, that is true. But bumped means the same as a sticky or a topped thread. It just means that the thread will not move down the list when new posts are posted in the other threads. When a thread is both locked and bumped, it contains a post we (the council) think is very important and usefull for the members to see. Like the guildelines for RPG-ing. If they weren't bumped they would have been on page 2 where noone would see them.