I've noticed that people are going in colo with their guildies and playing as a party in it. This is a wrong behaviour, Colosseum is a free pvp map, not YOUR GUILD vs other players. If you guys keep that up, people will just quit playing colo (there's very few people playing it even now) and you'll have to kill your beloved guildies anyway.
And don't tell me you don't do that on purpouse, you guys go around in the arena deliberately killing specific targets and never attacking each other. Sadly, it's pretty impossible to forbid people of the same guild playing the same colo, but I hope this message will be enough to make this stop.