Alright, I've discussed this with a couple of admins and they agree with my thoughts, and those are as follows;
If this was truly to force a map change, then it is heavily against the rules, on the same strain as a few people deciding to kill the Viscount on a DTV server.
This is not okay, if it's a bit of fun, then it's only slightly better, you are still ruining it for the rest of the server.
I'll couple this with the ban request, also lodged against the Byzantium clan as a whole, the one with the poll during your "duel tournament".
Okay, verdict: I'm not going to ban anyone outright, but I'm not going to be a nice guy about it either - Don't use your majority populace to boot people from a server simply because you have something going on, last I checked, you can set up your own server, instead of commandeering an official server. (If however, given the lax evidence leveled against you in that case, he was getting in the way of duels, the fine, since he was breaking the rules. This is a warning however if the former is true.)
And if you were trying to force losses to change the map then, well, don't, simple as that.
This is a single warning to all of those involved, if another request is made (following the usual procedure, evidence and the like) then I'll have to follow through and ban those involved, no exceptions.
I hope this will cover everything, please make sure this doesn't happen again,
Tenne.