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So, grouping with alliance as a horde makes you able to kill your own faction, BUT THEY CAN'T ATTACK YOU BACK. How stupid is this? So if this indeed is bannable abuse, I got some proof here.
I'll agree that it's very lame, but they only features I can do are the following:
Turn Horde & Alliance grouping off everywhere
Or make Hyjal Free-for-all PvP which is very, very bad idea and would ruin the point of it.
But keep in mind that Hyjal is just a recreation place really, it's a side thing to do. If they are doing it, they are just wimps, Hyjal is not at all required to be at on this server.
Administrator - Project Lead / Server Management / Core Development