In case the cheater/teamkiller happens to disconnect or get kicked, you can still ban them using their B3 ID — you did !id them, right? (Even if you didn’t, you can still use !lookup or find their B3 ID on their Echelon page.) The relevant part is the usually six-figure number starting with @ — you just do !b @123456 and that’s it. (Other commands work too, within reasonable limits, of course — slapping someone not connected wouldn’t make a whole lot of sense, but doing !follow for a suspicious player is a useful trick.) Be careful and always double-check the @ID: mods cannot undo bans and have to ask admins to do so.