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Hmm... -- Good god!
From what I gather the team had nine players from the Portuguese Nations Cup team and another six from CHSGI. I'd assume that both groups were on their separate TeamSpeak-servers.
Nine players from one group in the same team might be a bit much, but then it is only sensible to meet on a TeamSpeak-server or similar if one wants to play as a team. It would have been thoughtful, if some of the players of either group or even one of the groups in its entirety had switched to the other team (although one CHSGI can be seen in the opposing team), but I wouldn't consider these groups interest in playing together and using teamwork (with the help of TeamSpeak) as griefing or an action with malicious intent.
Players should take care to balance the teams, but that is true for clan-less players just as much as for clan-members. The team-stacking evidenced in the screen-shots may have spoiled the fun for some players, but I don't think it is something that deserves punishment. It should not happen constantly with the same clans/groups, however.
The players from one team protecting the archer from the other team is however something that I would consider to be something that is done intentionally and which spoils the fun of other players. I've been told that it happened twice and I think that's not often enough to warrant a ban. I'd caution the players to stick to protecting their team-mates - rather then their enemies - in the future, however.
Edit: Can someone expound on the intentional team-killing-part with proof or counter-proof?
Edit2: And please, calm down a bit - both sides.