%BChanServ DOWN%B has two syntaxes.

First form gives you the highest channel op you are allowed
in the channels you specify.  If you specify no channels, all
channels will be affected.

Second form removes all channel ops from the nick[s] in the
channel you specify, if you have sufficient rank.

Syntax: %BDOWN%B [%Uchannel%U [%Uchannel%U ...]]
Syntax: %BDOWN%B %Uchannel%U %Unick%U [[%Unick%U] ...]
